| 1 | Approaching the theoretical efficiency limit of quantum-dot lightemitting diodes via synergistic optimization显示文摘The importance of optical resonance in enhancing light outcoupling efficiency(OCE)is frequently overlooked in conventional bottom-emitting quantum-dot light-emitting diodes(QLEDs)due to their weak microcavity effect.Herein,we show that by synergistically optimizing the optical and the electrical performances,QLEDs with efficiency approaching the theoretical limit can be realized.By introducing a high refractive index indium zinc oxide(IZO)electrode and optimizing its thickness,the light OCE is significantly improved and consequently the red QLEDs exhibit an external quantum efficiency(EQE)of 33.2%,which is 1.4-fold higher than that of the reference devices with conventional indium tin oxide(ITO)electrodes.Moreover,with a high refractive index plastic substrate and a microlens array,the EQE can further be improved to a record value of 37.5%.Similar results are obtained in green and blue devices,which show an EQE of 18.8%and 14.4%,respectively.We also predict that the theoretical EQE limit of red,green,and blue QLEDs can reach 35.4%-36.5%,24.8%-34.0%,and 25.1%-35.8%,respectively,without using any light outcoupling structures.The proposed synergistic optimization strategy enables the efficiencies of red,green,and blue QLEDs to approach their theoretical limits. | Haotao Li Fengshou Tian Shuming Chen | 2023 | Nano Research2023，16，7： | 0 |
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