Control of Barrier Width in Perovskite Multiple Quantum Wells for High Performance Green Light–Emitting Diodes,Advanced Optical Materials

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Control of Barrier Width in Perovskite Multiple Quantum Wells for High Performance Green Light–Emitting Diodes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-12-05 , DOI: 10.1002/adom.201801575
Maotao Yu ₁ , Chang Yi ₁ , Nana Wang ₁ , Liangdong Zhang ₁ , Renmeng Zou ₁ , Yunfang Tong ₁ , Hong Chen ₁ , Yu Cao ₁ , Yarong He ₁ , Ying Wang ₁ , Mengmeng Xu ₁ , Yang Liu ₂ , Yizheng Jin ₂ , Wei Huang _{1,

3} , Jianpu Wang ₁

Affiliation

Solution‐processed, self‐organized multiple quantum well (MQW) perovskites possess good film coverage and high photoluminescence quantum efficiency, which are promising for high performance light‐emitting diodes (LEDs). However, due to the inclusion of insulating large organic cation as barrier layer, the charge transport in MQW perovskites is not as efficient as 3D perovskites, which limits the improvement of power conversion efficiency of MQW perovskite LEDs. Here, it is demonstrated that by molecular engineering, the conductivity of MQW perovskite film can be effectively increased by reducing the barrier width in QWs, thus leading to enhanced device performance. By controlling the constitution of the narrow‐barrier‐width MQW perovskites, one can achieve green LEDs with a high luminance of 30 000 cd m⁻² at a low voltage of 6 V and a peak external quantum efficiency of 7.7%. Moreover, the green perovskite LEDs show a lifetime of 63 min with initial luminance of 1330 cd m⁻², representing one of the best performing green perovskite LEDs. Here, a promising strategy is provided to further boost the efficiency, brightness, and stability of MQW perovskite LEDs.

中文翻译：

高性能绿光二极管的钙钛矿多量子阱中势垒宽度的控制

经过溶液处理的自组织多量子阱（MQW）钙钛矿具有良好的薄膜覆盖率和高的光致发光量子效率，这对于高性能发光二极管（LED）来说是有希望的。但是，由于包含绝缘的大有机阳离子作为阻挡层，因此MQW钙钛矿中的电荷传输不如3D钙钛矿有效，这限制了MQW钙钛矿LED的功率转换效率的提高。在这里，证明了通过分子工程，可以通过减小QW中的势垒宽度来有效地增加MQW钙钛矿膜的电导率，从而导致增强的器件性能。通过控制窄壁垒宽度MQW钙钛矿的组成，可以实现具有30000 cd m ^-2的高亮度的绿色LED。在6 V的低电压和7.7％的峰值外部量子效率下工作。此外，绿色钙钛矿LED的使用寿命为63分钟，初始亮度为1330 cd m ^-2，是性能最好的绿色钙钛矿LED之一。在这里，提供了一种有前途的策略来进一步提高MQW钙钛矿LED的效率，亮度和稳定性。

更新日期：2018-12-05

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