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| 1 | 单层热激活延迟荧光有机发光器件及其激子分布特性显示文摘单层结构对简化有机电致发光器件(OLED)的制备工艺及降低其制造成本具有重要意义。本文采用非掺杂热激活延迟荧光(TADF)发光层,结合C_(60)(2 nm)/MoO_(3)(3 nm)/C_(60)(2 nm)修饰的ITO阳极及4,7-二苯基-1,10-菲啰啉(Bphen,3 nm)修饰的Ag阴极,制备了单层TADF器件(TADF-OLED)。该单层TADF-OLED具有良好的空穴和电子注入能力,开启电压为3 V,最大电流、功率及外量子效率分别可达到37.7 cd/A、47.4 lm/W和13.24%。然后,我们利用“探针法”研究了该单层TADF-OLED的激子分布情况,发现大部分激子在发光层靠近阳极侧形成。最后,我们利用经典电磁学理论对器件的光取出效率进行模拟分析,证实了这种激子分布特性有助于实现较高的光取出效率,进而改善器件的外量子效率。 | 唐歌 刘士浩 张乐天 谢文法 | 2022 | 发光学报2022，43，4： | 5 |
| 2 | 隧道磁阻传感器在OLED电流检测中的应用显示文摘有机发光二极管(Organic Light-Emitting Diode,OLED)显示器的亮度、色域和显示不均(Mura)等特性与其驱动电流息息相关。为了实现封装后OLED电流的无损检测,本文建立了一种基于隧道磁阻(Tunneling Magnetoresistance,TMR)效应的OLED电流无损检测方法。首先,根据OLED显示器亮度与驱动电流的关系,得到一行像素全部点亮时的驱动电流是40 mA,通过仿真分析40 mA电流的空间磁场分布,估算出TMR磁传感器的灵敏度指标要求。然后,选择TMR2922作为磁传感器,实验研究了点亮双行、多行和单列像素时,显示器磁场与电流的关系、屏幕电磁兼容问题和传感器灵敏度问题。最后,对比分析了不同驱动电流下,TMR2922的磁场数据和Hyperion色度计的光学数据。仿真表明,高度为1.5 mm时磁场传感器的噪声要优于1.1 nT/√Hz;实验结果表明,在无屏蔽环境下TMR2922可以检测出OLED mA级的行电流,对于μA级的列电流需要灵敏度更高的磁传感器。 | 朱浩波 王海 李子豪 孔祥燕 | 2023 | 液晶与显示2023，38，5： | 0 |
| 3 | 湿法有机电致发光器件:结构、器件物理及制备工艺显示文摘有机电致发光器件(OLED)在照明领域的产业化发展仍然受到高成本的制约,而湿法OLED可显著降低制造成本。但是,相比于热蒸镀OLED,湿法OLED在构建多层薄膜体系上面临更大的挑战。鉴于已有相关综述从材料工程角度对湿法OLED进行了总结,本文将主要从器件物理和制备工艺方面对湿法OLED进行概述。首先从器件载流子动力学和光物理角度分析各功能层的必要性。接着介绍常用的湿法薄膜制备工艺,并讨论制备多层湿法薄膜所涉及的问题。最后对湿法OLED的发展进行了展望。 | 刘士浩 张乐天 谢文法 | 2022 | 光电工程2022，49，5： | 0 |
| 4 | 薄膜电致发光器件的光功率耗散特性显示文摘针对薄膜型电致发光器件中的光损耗限制器件外部量子效率问题,提出结合多层薄膜结构和经典电磁学理论,研究薄膜型电致发光器件的光功率耗散特性.分别讨论了发光层的折射率以及器件结构对器件光功率耗散特性的影响.结果表明:使用高折射率的发光层,可以显著降低器件中表面等离极化激元引起的光损耗;由于不存在波导和衬底模式,顶发射器件结构在光取出效率方面上具有优势. | 王健 张乐天 | 2023 | 东北师大学报(自然科学版)2023，55，4： | 0 |
| 5 | 高色纯度有机发光器件研究进展显示文摘为了使有机发光显示技术满足国际电信联盟为超高清电视所制定的色域标准(BT 2020),高色纯度有机发光器件(OLED)的研究与开发具有重要意义。本文分别从窄带发光OLED材料和微腔OLED器件两方面介绍高色纯度有机发光器件的重要研究进展。首先,分析了分子的振动耦合对有机发光材料色纯度的影响,并针对荧光、磷光和热激活延迟荧光(TADF)3种材料,分别讨论了目前改善有机发光色纯度的方法,总结了最新的材料设计策略与研究结果。然后,介绍了微腔效应的原理,分析其对有机发光器件光谱的修饰与窄化作用,并介绍了利用微腔效应实现高色纯度发光的器件结构设计与优化方案。最后,讨论了高色纯度OLED器件在显示领域的未来前景与挑战。 | 徐孟鑫 刘士浩 张乐天 谢文法 | 2023 | 液晶与显示2023，38，4： | 0 |
| 6 | Solution-processed halide perovskite microcavity exciton-polariton light-emitting diodes working at room temperature显示文摘Exciton-polaritons offer the potential to achieve electrically pumped perovskite polariton lasers with much lower current thresholds than conventional photonic lasers. While optically pumped exciton-polaritons have been widely studied in halide perovskites, electrically-pumped polaritons remain limited. In this study, we demonstrate the use of a solution-processing strategy to develop halide perovskite polariton light-emitting diodes(LEDs) that operate at room temperature. The strong coupling of excitons and cavity photons is confirmed through the dispersion relation from angle-resolved reflectivity, with a Rabi splitting energy of 64 meV. Our devices exhibit angle-resolved electroluminescence following the low polariton branch and achieve external quantum efficiencies of 1.7%, 3.85%, and 3.7% for detunings of 1.1,-77, and-128 meV, respectively. We also explore devices with higher efficiency of 5.37% and a narrower spectral bandwidth of 6.5 nm through the optimization of a top emitting electrode. Our work demonstrates, to our knowledge, the first room-temperature perovskite polariton LED with a typical vertical geometry and represents a significant step towards realizing electrically pumped perovskite polariton lasers. | TIANYU LIU PENG RAN YIRONG SU ZENG CHEN RENCHEN LAI WEIDONG SHEN YAOGUANG MA HAIMING ZHU YANG(MICHAEL)YANG | 2023 | Photonics Research2023，11，10： | 0 |
| 7 | High-efficiency and reduced efficiency roll-off of top-emitting organic light-emitting diodes显示文摘Top-emitting organic light-emitting diodes(TEOLEDs) have attracted extensive attention for their high brightness and flat-panel display.However,the efficiency roll-off at high brightness is the issue that needs to be resolved for further practical applications using TEOLED devices.Herein,a serial of high-efficiency tandem TEOLED introducing a fullerene/zinc-phthalocyanine organic semiconductor heterojunction as a charge generation layer is demonstrated.With unique photovoltaic properties,the charge generation layer can absorb part of the photons emitted by the emission layer(Ir(ppy)3) and generate electrons and holes.By optimizing the thickness of the charge generation layer,the pure green electroluminescent TEOLED device manufactured has a high brightness of 156 000 cd/cm^(2) and a maximum current efficiency of 86 cd/A.Importantly,relying on the energy between the photovoltaic and the microcavity effects,only 1.5% of the efficiency roll-off is obtained at 1 000—10 000 cd/cm^(2).Introducing fullerene/zinc-phthalocyanine as the charge-generating layer provides a promising alternative for developing high-efficiency tandem TEOLED devices. | WANG Zhen XI Yuanfeng LIANG Zhenshan TAN Xing XU Dongpo CHEN Weiwei | 2023 | Optoelectronics Letters2023，19，7： | 0 |
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