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High-Efficiency and Emission-Tunable Inorganic Blue Perovskite Light-Emitting Diodes Based on Vacuum Deposition
Small ( IF 13.0 ) Pub Date : 2023-09-01 , DOI: 10.1002/smll.202305379 Zhiyuan He 1 , Chencheng Peng 1 , Runda Guo 1 , Ben Chen 1 , Xin Li 1 , Xiangyu Zhu 1 , Jian Zhang 1 , Wenxi Liang 1 , Lei Wang 1
Small ( IF 13.0 ) Pub Date : 2023-09-01 , DOI: 10.1002/smll.202305379 Zhiyuan He 1 , Chencheng Peng 1 , Runda Guo 1 , Ben Chen 1 , Xin Li 1 , Xiangyu Zhu 1 , Jian Zhang 1 , Wenxi Liang 1 , Lei Wang 1
Affiliation
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The fabrication of perovskite light-emitting diodes (PeLEDs) with vacuum deposition shows great potential and commercial value in realizing large-area display panel manufacturing. However, the electroluminescence (EL) performance of vacuum-deposited PeLEDs still lags behind the counterparts fabricated by solution process, especially in the field of blue PeLEDs. Here, the fabrication of high-quality CsPbBr3−xClx film through tri-source co-evaporation is reported to achieve high photoluminescence quantum yield (PLQY). Compared with the conventional traditional dual-source co-evaporation, the tri-source co-evaporation method allows for freely adjustable elemental ratios, enabling the introduction of the lattice-matched Cs4Pb(Br/Cl)6 phase with the quantum-limited effect into the inorganic CsPb(Br/Cl)3 emitter. By adjusting the phase distribution, the surface defects of the emitter can be effectively reduced, leading to better blue emission and film quality. Further, the effects of Cs/Pb ratio and Br/Cl ratio on the PLQY and carrier recombination dynamics of perovskite films are investigated. By optimizing the deposition rate of each precursor source, spectrally stable blue PeLEDs are achieved with tunable emission ranging from 468 to 488 nm. Particularly, the PeLEDs with an EL peak at 488 nm show an external quantum efficiency (EQE) of 4.56%, which is the highest EQE value for mixed-halide PeLEDs fabricated by vacuum deposition.
中文翻译：
基于真空沉积的高效、发射可调无机蓝色钙钛矿发光二极管
真空沉积法制备钙钛矿发光二极管（PeLED）在实现大面积显示面板制造方面显示出巨大的潜力和商业价值。然而，真空沉积PeLED的电致发光（EL）性能仍然落后于溶液工艺制造的同类产品，特别是在蓝色PeLED领域。据报道，通过三源共蒸发制备高质量 CsPbBr 3− x Cl x薄膜可实现高光致发光量子产率（PLQY）。与传统的双源共蒸发相比，三源共蒸发方法可以自由调节元素比例，从而能够引入具有量子限制的晶格匹配的Cs 4 Pb(Br/Cl) 6相。影响无机CsPb(Br/Cl) 3发射体。通过调整相位分布，可以有效减少发射极的表面缺陷，从而获得更好的蓝光发射和薄膜质量。此外，还研究了Cs/Pb比和Br/Cl比对钙钛矿薄膜PLQY和载流子复合动力学的影响。通过优化每个前驱体源的沉积速率，实现了光谱稳定的蓝色 PeLED，其发射范围为 468 至 488 nm。特别是，EL峰值在488 nm的PeLED显示出4.56%的外量子效率（EQE），这是通过真空沉积制造的混合卤化物PeLED的最高EQE值。
更新日期：2023-09-01
中文翻译：
基于真空沉积的高效、发射可调无机蓝色钙钛矿发光二极管
真空沉积法制备钙钛矿发光二极管（PeLED）在实现大面积显示面板制造方面显示出巨大的潜力和商业价值。然而，真空沉积PeLED的电致发光（EL）性能仍然落后于溶液工艺制造的同类产品，特别是在蓝色PeLED领域。据报道，通过三源共蒸发制备高质量 CsPbBr 3− x Cl x薄膜可实现高光致发光量子产率（PLQY）。与传统的双源共蒸发相比，三源共蒸发方法可以自由调节元素比例，从而能够引入具有量子限制的晶格匹配的Cs 4 Pb(Br/Cl) 6相。影响无机CsPb(Br/Cl) 3发射体。通过调整相位分布，可以有效减少发射极的表面缺陷，从而获得更好的蓝光发射和薄膜质量。此外，还研究了Cs/Pb比和Br/Cl比对钙钛矿薄膜PLQY和载流子复合动力学的影响。通过优化每个前驱体源的沉积速率，实现了光谱稳定的蓝色 PeLED，其发射范围为 468 至 488 nm。特别是，EL峰值在488 nm的PeLED显示出4.56%的外量子效率（EQE），这是通过真空沉积制造的混合卤化物PeLED的最高EQE值。
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