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| 1 | Full-color quantum dots active matrix display fabricated by ink-jet printing显示文摘Making full-color active matrix display based on quantum dot light emitting diodes(AM-QLEDs) via ink-jet printing is attractive in display industry due to QLEDs' wide color gamut and their potential manufacturing advantages of large screen size and low cost. The challenges for realizing AM-QLED display are how to achieve high quality films through ink-jet printing, multi-color patterning, electroluminescence(EL) color purity, and high efficiency. Herein, a 2-inch diagonal full-color AM-QLEDs display with pixel density of 120 pixels per inch(PPI) fabricated by ink-jet printing technique is presented. Driven by a metal oxide TFT(MOTFT) back-panel, the display exhibits a maximum brightness of 400 cd m.2, and a color gamut of 109%(NTSC 1931). The red, green, and blue(RGB) monochrome QLEDs passive matrix panels fabricated by ink-jet printing technique have a current efficiency(CE) of 2.5, 13.9, and 0.30 cd A.1, respectively. To the best of our knowledge, the efficiencies are the highest among passive matrix QLEDs panels made by ink-jet printing technique. The ink-jet printed QDs films show good thickness uniformity due to high viscosity and low volatility of the printable inks, and no cross-contamination between adjacent pixels resulting from the hydrophobic pixel defining layer. | Congbiao Jiang Lan Mu Jianhua Zou Zhiwei He Zhenji Zhong Lei Wang Miao Xu Jian Wang Junbiao Peng Yong Cao | 2017 | Science China Chemistry2017，60，10： | 10 |
| 2 | Inverted polymer solar cells with a solution-processed zinc oxide thin film as an electron collection layer显示文摘A solution-processed zinc oxide (ZnO) thin film as an electron collection layer for polymer solar cells (PSCs) with an inverted device structure was investigated. Power conversion efficiencies (PCEs) of PSCs made with a blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) are 3.50% and 1.21% for PSCs with and without the ZnO thin film, respectively. Light intensity dependence of the photocurrent and the capacitance-voltage measurement demonstrate that the increased PCEs are due to the restriction of the strong bimolecular recombination in the interface when a thin ZnO layer is inserted between the polymer active layer and the ITO electrode. These results demonstrate that the ZnO thin film plays an important role in the performance of PSCs with an inverted device structure. | YANG TingBin QIN DongHuan LAN LinFeng HUANG WenBo GONG Xiong PENG JunBiao CAO Yong | 2012 | Science China Chemistry2012，55，5： | 10 |
| 3 | Inkjet printing for electroluminescent devices: emissive materials, film formation, and display prototypes显示文摘打印的 Inkjet (IJP ) 是为以一种划算的方式的 realizinghigh 精确性模式的一种万用的技术。它是 consideredto 是最有希望的候选人之一代替 expensivethermal 蒸发技术,它被制作便宜、大 electroluminescent 设备的 difficultyof 妨碍,如此的 asorganic 轻射出的二极管(OLED ) 和量点 light-emittingdiodes (QLED ) 。在这邀请评论,我们首先介绍一些可印刷的放射性的材料的 recentprogress,包括在 OLEDsand QLED 的聚合物,小分子,和无机的胶体的量点 emitters。随后,我们在关键因素上集中那 influencefilm 形成。由探索稳定的墨水明确的表达,选择 printparameters ,并且实现微滴免职控制, uniformfilm 能被获得,它接着 performance.Finally 改进设备,一系列出色的 打印inkjet 的 OLED 和 QLED prototypedisplay 面板被总结,为大、高分辨率的扁平的面板的制造显示的 IJPin 建议有希望的未来。 | Luhua LAN Jianhua ZOU Congbiao JIANG Benchang LIU Lei WANG Junbiao PENG | 2017 | Frontiers of Optoelectronics2017，10，4： | 5 |
| 4 | Appending triphenyltriazine to 1,10-phenanthroline: a robust electron-transport material for stable organic light-emitting diodes显示文摘There has been an increasing demand for high-performance and cost-effective organic electron-transport materials for organic light-emitting diodes(OLEDs).In this contribution,we present a simple compound 3-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-1,10-phenanthroline through the facile Pd-catalyzed coupling of a triphenyltriazine boronic ester with 3-bromo-1,10-phenanthroline.It shows a high T_g of 112°C.The ultraviolet photoelectron spectroscopy measurements reveal a deep HOMO level of -6.5 eV.The LUMO level is derived as-3.0 eV,based on the optical bandgap.The low-temperature solid-state phosphorescent spectrum gives a triplet energy of ~2.36 eV.n-Doping with8-hydroxyquinolatolithium(Liq,1:1)leads to considerably improved electron mobility of 5.2×10^(-6)–5.8×10^(-5)cm^2V^(-1)s^(-1)at E=(2–5)-10~5V cm^(-1),in contrast with the triarylphosphine oxidephenantroline molecular conjugate we reported previously.It has been shown that through optimizing the device structure and hence suppressing polaron-exciton annihilation,introducing this single Liq-doped electron-transport layer could offer high-efficiency and stable phosphorescent OLEDs. | Guang Jin Jun-Zhe Liu Jian-Hua Zou Xiao-Lan Huang Meng-Jiao He Ling Peng Ling-Ling Chen Xu-Hui Zhu Junbiao Peng Yong Cao | 2018 | Science Bulletin2018，63，7： | 5 |
| 5 | Electroluminescence and photoluminescence of dioctylfluorene and 4,7-dithien-2-yl-2,1,3-benzothiadiazole copolymers显示文摘Dioctylfluorene (DOF) and 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DBT) copolymers synthesized in our lab with different compositions of DBT (1%, 5%, 15% and 25%) were utilized to fabricate bilayered light emitting diodes. External quantum efficiency (QE) of the diode fabricated from the copolymer with 15% DBT content reaches 1.4% (ph/el), over 1.0 cd/A in luminance efficiency at the driving voltage of 4.2 V. The highest luminance can reach 3780 cd/m2 at 8.2 V. Devices emit a saturated red light centered at 675 nm with chromaticity coordinate changed from x=0.66, y=0.32 for PDOF-DBT1 (1% DBT) to x=0.70, y= 0.28 for PDOF-DBT25 (25% DBT). | PENG Junbiao, XU Yishe, HOU Qiong, NIU Yuhua, RUAN Wenying & CAO YongInstitute of Polymer Optoelectronic Materials & Devices, South China University of Technology, Guangzhou 510640, China Department of Applied Physics, South China University of Technology | 2002 | Chinese Science Bulletin2002，47，20： | 5 |
| 6 | Very-High Color Rendering Index Hybrid White Organic Light-Emitting Diodes with Double Emitting Nanolayers显示文摘A very-high color rendering index white organic light-emitting diode(WOLED) based on a simple structure was successfully fabricated. The optimized device exhibits a maximum total efficiency of 13.1 and 5.4 lm/W at 1,000 cd/m2. A peak color rendering index of 90 and a relatively stable color during a wide range of luminance were obtained. In addition, it was demonstrated that the 4,40,400-tri(9-carbazoyl) triphenylamine host influenced strongly the performance of this WOLED.These results may be beneficial to the design of both material and device architecture for high-performance WOLED. | Baiquan Liu Miao Xu Lei Wang Hong Tao Yueju Su Dongyu Gao Linfeng Lan Jianhua Zou Junbiao Peng | 2014 | Nano-Micro Letters2014，6，4： | 4 |
| 7 | Highly efficient pure white polymer light-emitting devices based on poly(N-vinylcarbazole) doped with blue and red phosphorescent dyes显示文摘Efficient white-polymer-light-emitting devices (WPLEDs) have been fabricated with a single emitting layer containing a hole-transporting host polymer,poly(N-vinylcarbzole),and an electron-transporting auxiliary,1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]-phenylene,codoped with two phosphorescent dyes:Iridium(III)bis (2-(4,6-difluorophenyl)-pyridinato-N,C2') picolinate (FIrpic) and home-made Ir-G2 for blue and red emission,respectively.With the structure of ITO/PEDOT:PSS 4083(40 nm)/emission layer(80 nm)/Ba(4 nm)/Al(120 nm),the device showed a maximal luminous efficiency (LE) of 13.5 cd A-1(corresponding to an external quantum efficiency (EQE) of 6.8%),and a peak power efficiency (PE) of 6.5 lm W-1 at 6.0 V.Meanwhile,the device exhibited pure white emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.34,0.35) at a current density of 12 mA cm-2,which is very close to the equi-energy white point with CIE coordinates of (0.33,0.33).The device performance can be further optimized when more balanced hole/electron injection is achieved by incorporating a lower conducting type anode buffer layer (PEDOT:PSS) and incorporating poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorenene)-alt-2,7-(9,9-dioctyfluorene)] (PFN) as an electron injection layer at the cathode.The optimized device showed an LE of 24.6 cd A-1 (with an EQE of 14.1%),while the peak power efficiency reached 12.66 lm W-1.Moreover,the WPLEDs showed good electroluminescence (EL) stability over a wide range of operating current density and luminance. | HU SuJun ZOU JianHua ZHOU GuiJiang LI DongYun WU HongBin SU ShiJian WONG Wai-Yeung YANG Wei PENG JunBiao CAO Yong | 2011 | Science China Chemistry2011，54，4： | 4 |
| 8 | Doping-free tandem white organic light-emitting diodes显示文摘Tandem white organic light-emitting diodes(WOLEDs) are of great research interest since they can greatly boost the performance compared with the single-unit counterparts. However, their structures are more complicated than those of single-unit OLEDs. Besides, to achieve high performance, the doping technology is required to tandem OLEDs, particularly for tandem WOLEDs, further complicating the structures. Herein, doping-free tandem WOLEDs, for the first time, have been demonstrated. By managing an effective doping-free charge generation layer to interconnect doping-free emitting layers/charge transport layers, high-performance doping-free tandem WOLEDs have been developed. The blueyellow device accomplishes the simplified structure/short fabrication time/reduced cost/high efficiency/low efficiency roll-off/low voltage/high luminance trade-off, which cannot be achieved by previous tandem WOLEDs. Remarkably, the efficiency(81.2 cd A^(-1)) is ~2-fold higher than the highest efficiency of previous doping-free WOLEDs and even higher than those of some best doping tandem WOLEDs. The maximum luminance is 44,886 cd m^(-2), which is the highest for doping-free WOLEDs.Besides, the blue-red device can exhibit a color rendering index(CRI) of 67, which is even higher than that of some representative three-color tandem WOLEDs. Such findings may not only represent a significant step for doping-free WOLEDs, but unlock a novel avenue that doping-free tandem WOLEDs are promising to achieve the simplicity and high performance trade-off. | Baiquan Liu Lei Wang Hong Tao Miao Xu Jianhua Zou Honglong Ning Junbiao Peng Yong Cao | 2017 | Science Bulletin2017，62，17： | 3 |
| 9 | Molecular engineering of an electron-transport triarylphosphine oxide-triazine conjugate toward high-performance phosphorescent organic light-emitting diodes with remarkable stability显示文摘Organic electron-transport materials are an essential component to boost performances and stability of organic light-emitting diodes. We present a robust organic electron-transport compound 3-(6-(3-(4,6-bis(4-biphenylyl)-1,3,5-triazin-2-yl)phenyl)pyridin-2-yl)phenyldiphenylphosphine oxide by facilely coupling the triphenylphosphine oxide moiety to the 2-phenyl-4,6-bis(4-biphenylyl)-1,3,5-triazine unit via a 2,6-pyridinylene linker. It is well soluble in weakly polar solvents and possesses a high Tg of 123 ℃ with an exceptional Td≈470 ℃ at 1% weight loss and deep HOMO/LUMO levels of ca.-6.45/-3.06 eV. The phosphorescent spectrum measured in solid state at 77 K reveals a notable triplet energy of 2.88 eV. n-Doping with 8-hydroxyquinolatolithium(Liq) produces the electron mobility value of 4.66×10-5–3.21×10-4 cm2 V-1 s-1@(2–5)×105 V cm-1.Moreover, the contrasting solubility of the bromo reaction intermediate and the new compound in alcoholic solvents facilitates separation. The characterizations of bottom-and top-emission green phosphorescent OLEDs involving this single Liq-doped electron-transport layer reveal long stability. In particular, the latter provides outstanding performances with 77.4 cd A–1(corresponding to an EQE of 18.7%) and 86.8 lm W–1@ca. 1000 cd m-2, based on the green emitter bis(2-phenylpyridine)(2-(4-methyl-3-phenylphenyl)pyridine)iridium(Ⅲ). Moreover, driven by a constant current for ca. 640 h, the initial luminance of 1000 cd m–2 appears almost no decay. | Ling-Ling Chen Ling Peng Lin-Ye Wang Xu-Hui Zhu Jian-Hua Zou Junbiao Peng | 2020 | Science China Chemistry2020，63，7： | 3 |
| 10 | Electroluminescence performances of 1,1-bis(4-(N,N-dimethylamino)phenyl)-2,3,4,5-tetraphenylsilole based polymers in three cathode architectures显示文摘A new silole monomer with two 4-(N,N-dimethylamino)phenyl substitutions on silicon atom as designed and synthesized.Three copolymers PF-N-HPS1,PF-N-HPS10 and PF-N-HPS20 were then obtained by copolymerizations of 2,7-fluorene derivatives with the silole monomer at feed ratios of 1%,10%,and 20%.Their UV-vis absorption,electrochemical,photoluminescent,and electroluminescent (EL) properties were investigated.PF-N-HPS possessed HOMO levels of 5.25-5.58 eV,and showed green emissions.Using PF-N-HPS as the emissive layer,three different polymer light-emitting diodes were fabricated as device A with ITO/PEDOT/PF-N-HPS/Al,device B with ITO/PEDOT/PF-N-HPS/Ba/Al,and device C with ITO/PEDOT/PF-N-HPS/TPBI/Ba/Al.For the device A,PF-N-HPS only showed very low EL efficiency of 0.06-0.33 cd/A,indicating that the Al cathode could not inject electron efficiently to the emissive polymers containing the 4-(N,N-dimethylamino)phenyl groups.For the device B,low work function Ba supplied better electron injections,and the EL efficiency could be improved to 0.85-1.44 cd/A.TPBI with a deep HOMO level of 6.2 eV could enhance electron transport and hole blocking.Thus modified recombinations and largely elevated EL efficiency of 4.56-7.96 cd/A were achieved for the device C.The separation of the emissive layer and metal cathode with the TPBI layer may also suppress exciton quenching at the cathode interface. | LIU ZhiTian HU SuJun ZHANG LinHua CHEN JunWu PENG JunBiao CAO Yong | 2013 | Science China Chemistry2013，56，8： | 2 |
| 11 | Landscape of the regulatory elements for lysine 2-hydroxyisobutyrylation pathway显示文摘短链的丰满的酸和他们的相应 acyl-CoAs 在新陈代谢的小径的十字路口坐并且在多样的细胞的过程起重要作用。他们也是为蛋白质 translational 以后离氨酸 acylation 修正的先锋。一个引人注目的例子是最新识别的离氨酸 2-hydroxyisobutyrylation (K 从 2-hydroxyisobutyrate 和 2-hydroxyisobutyryl-CoA 被导出的 hib ) 。Histone K hib 被显示了在 spermatogenic 房间与活跃基因表示被联系。然而,调整这条 translational 以后离氨酸 acylation 小径的关键元素仍然保持未知。这妨碍了这修正由施加它的生物功能的机制的描述。这里,我们在开始发育的酵母显示出那 Esa1p,它在人的相当或相同事物 Tip60 能增加 K hib 到在 vitro 并且在 vivo 的底层蛋白质。另外,我们作为主要的酶识别了 HDAC2 和 HDAC3 移开 K hib 。而且,我们报导第一 K 在哺乳动物的房间的 hib proteome,识别 6 548 K 1 725 底层蛋白质上的 hib 地点。我们的学习因此为 histone K hib 标记,和主要 K hib 蛋白质底层。这些结果不仅说明这条新离氨酸 acylation 小径的风景,而且为学习与这条小径联系的细胞的代谢物的多样的功能打开新大街。 | He Huang Zhouqing Luo Shankang Qi Jing Huang Peng Xu Xiuxuan Wang Li Gao Fangyi Li Jian Wang Wenhui Zhao Wei Gu Zhucheng Chen Lunzhi Dai Junbiao Dai Yingming Zhao | 2018 | Cell Research2018，28，1： | 2 |
| 12 | The effect of spacer in hybrid white organic light emitting diodes显示文摘Two kinds of highly efficient,bright hybrid white organic light emitting diodes have been fabricated by utilizing ambipolar material 4,4-N,N-dicarbazolebiphenyl(CBP)and unipolar material N,N0-di(naphthalene-1-yl)-N,N0-diphenyl-benzidine(NPB)as the spacer,respectively.By adjusting the thickness of spacers together with effectively utilizing combinations of exciton-harnessed orangephosphorescence/blue-fluorescence,the current efficiency of optimal device with CBP spacer and device with NPB spacer are 31.0 and 38.9 cd/A,the maximum power efficiency are 23.9 and 29.1 lm/W,the maximum brightness are 87,249 and 75,501 cd/m2,and the Commission Internationale de l’Eclairage(CIE)coordinates are(0.42,0.43)and(0.47,0.44)at a voltage of 11 V,respectively.Furthermore,systematic investigations focused on the effects of spacers on device performance have been performed.By virtue of the multifunctional spacer,energy transfer between the phosphorescent and fluorescent emitters can be avoided while the carriers still can pass through this spacer bridge,which is important to realize such high device performance.In addition,a novel concept that both ambipolar materials and unipolar materials can be the promising candidates for spacers has been proposed if the thickness of spacers with high triplet energy is optimized. | Baiquan Liu Miao Xu Hong Tao Yueju Su Dongyu Gao Jianhua Zou Linfeng Lan Junbiao Peng | 2014 | Chinese Science Bulletin2014，59，25： | 2 |
| 13 | Alloy-Electrode-Assisted High-Performance Enhancement-Type Neodymium-Doped Indium-Zinc-Oxide Thin-Film Transistors on Polyimide Flexible Substrate显示文摘Flexible thin-film transistors with high current-driven capability are of great significance for the next-generation new display technology.The effect of a Cu-Cr-Zr(CCZ)copper alloy source/drain(S/D)electrode on flexible amorphous neodymiumdoped indium-zinc-oxide thin-film transistors(NdIZO-TFTs)was investigated.Compared with pure copper(Cu)and aluminum(Al)S/D electrodes,the CCZ S/D electrode changes the TFT working mode from depletion mode to enhancement mode,which is ascribed to the alloy-assisted interface layer besides work function matching.X-ray photoelectron spectroscopy(XPS)depth profile analysis was conducted to examine the chemical states of the contact interface,and the result suggested that chromium(Cr)oxide and zirconium(Zr)oxide aggregate at the interface between the S/D electrode and the active layer,acting as a potential barrier against residual free electron carriers.The optimal NdIZO-TFT exhibited a desired performance with a saturation mobility(μsat)of 40.3 cm^(2)·V-1·s^(-1),an Ion/Ioff ratio of 1:24×10^(8),a subthreshold swing(SS)value of 0.12 V·decade^(-1),and a threshold voltage(Vth)of 0.83 V.This work is anticipated to provide a novel approach to the realization of highperformance flexible NdIZO-TFTs working in enhancement mode. | Kuankuan Lu Rihui Yao Wei Xu Honglong Ning Xu Zhang Guanguang Zhang Yilin Li Jinyao Zhong Yuexin Yang Junbiao Peng | 2021 | Research2021，，1： | 1 |
| 14 | Aromatic inorganic acid radical显示文摘Stable radicals are challenging to prepare due to their intrinsic high reactivity.Herein,three trisphenolamine radicals were readily synthesized and exhibited unexpected thermal/electrochemical stability and semiconductor property.These three nitroxide radicals could be considered as a class of aromatized nitro groups or HNO3 derivatives.The closed-shell nitro-like and open-shell nitroxide resonance structure contribute to their outstanding stability.Furthermore,the tunable ground states,extremely low band gap and p-type charge transport properties were systematically investigated.More importantly,the work presents the concept of aromatic inorganic acid radical(AIAR)and aggregation-induced radical(AIR)mechanism to understand the intrinsic structureproperty relationship of these radicals.In addition,we provide a novel strategy for the design of stable and low bandgap radicals for organic electronics,magnetics,spintronics,etc. | Jiawen Zhou Weiya Zhu Miao Zeng Qingqing Yang Ping Li Linfeng Lan Junbiao Peng Yuan Li Fei Huang Yong Cao | 2019 | Science China Chemistry2019，62，12： | 1 |
| 15 | Synthesis and characterization of novel red-emitting copolymers containing fluorene,diketopyrrolopyrrole,and phenothiazine units显示文摘A novel three-component copolymer (PFDP),derived from 9,9-dihexylfluorene,diketopyrrolopyrrole(DPP),and 10-octylphenothiazine,was synthesized through palladium-catalyzed Suzuki polycondensation in good yields. PFDP possessed moderate molecular weight and polydispersity,well-defined structure,and excellent thermal properties with an onset decomposition temperature at 357℃. PFDP in thin film exhibited red photoluminescence from DPP chromophore exclusively,with a peak at 602 nm. Electron-rich phenothiazine units sighificantly improved the injection and transport of holes by incorporating into polymer backbone. Light-emitting device was fabricated in the ITO/PEDOT:PSS/PVK/ polymer/Ba/Al configuration using PFDP as the emitting layer. The device based on PFDP showed red emission [CIE coordinate value (0.62,0.38)] that was close to the standard red (0.66,0.34). The results on electroluminescent performance revealed that PFDP may be a promising candidate for the red emitter with a maximum brightness of 259 cd/m2 and a maximum external quantum efficiency of 0.25%. | QIAO Zhi CAO DeRong LIU QiLin WENG JieNa HE ZhiCai HAN ShaoHu PENG JunBiao | 2009 | Science China Chemistry2009，52，12： | 1 |
| 16 | Synthesis and photophysical characterization of the free-radical copolymerization of metal oquinolate-pendant mono- mers with methyl methacrylate显示文摘 | Du Naiying Tian Renyu Peng Junbiao et at | 2005 | Journal of Polymer Science Part A: Polymer Chemistry2005，43，2： | 1 |
| 17 | Improved stability of blue TADF organic electroluminescent diodes via OXD-7 based mixed host显示文摘Thermally activated delayed fluorescence(TADF)organic light-emitting diodes(OLEDs)have been demonstrated in applications such as displays and solid-state lightings.However,weak stability and ineffi-cient emission of blue TADF OLEDs are two key bottlenecks limiting the development of solution processable displays and white light sources.This work presents a solution-processed OLED using a blue-emitting TADF small molecule bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]sulfone(DMAC-DPS)as an emitter.We comparatively investigated the effects of single host poly(Nvinylcarbazole)(PVK)and a co-host of 60%PVK and 30%2,2′-(1,3-phenylene)-bis[5-(4-tert-butylphenyl)-1,3,4-oxadiazole](OXD-7)on the device performance(the last 10%is emitter DMAC-DPS).The co-host device shows lower turn-on voltage,similar maximum luminance,and much slower external quantum efficiency(EQE)rolloff.In other words,device stability improved by doping OXD-7 into PVK,and the device impedance simultaneously and significantly reduced from 8.6103 to 4.2103 W at 1000 Hz.Finally,the electroluminescent stability of the co-host device was significantly enhanced by adjusting the annealing temperature. | Weiguang LI Jie TANG Yanqiong ZHENG Junbiao PENG Jianhua ZHANG Bin WEI Xifeng LI | 2021 | Frontiers of Optoelectronics2021，14，4： | 1 |
| 18 | Write-once read-many-times memory based on a single layer of pentacene 显示文摘 | Shi Shengwei Peng Junbiao Lin Jian | 2009 | IEEE Electron Device letters2009，30，4： | 1 |
| 19 | Cross-linked Alq3-containing polymers with improved electroluminescence efficiency used for OLEDs显示文摘 | DU Naiying TIAN Renyu PENG Junbiao | 2006 | Macromol Rapid Commun2006，27，6： | 1 |
| 20 | Improved device efficiency and color purity:spectral redshift and line-narrowing for poly-1,4-phenylene vinylene]via blending with phenyl-substituted polyderivatlves显示文摘 | Zhang Yong Peng Junbiao Mo Yueqi | 2004 | Applied Physics Letter2004，85，22： | 1 |
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