Tengfei Long;Han Miao;Sheng Wang;Rui Li;Chengxi Zhang;Lin Wang;Tao Hu;Chonghe Li;Xuyong Yang
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引用次数: 0
Abstract
Perovskite nanocrystals (PeNCs)-based light-emitting diodes (PeLEDs) are emerging as promising candidates for next-generation electroluminescent devices. However, their practical application is limited due to the poor stability of PeNCs. Here, we demonstrate an efficient and stable PeLED enabled by entropy-driven CsCd
0.1
Pb
0.8
Sr
0.1
Br
3
PeNCs as emitter. Based on density functional theory (DFT) calculations with the Compound Energy Formalism (CEF) model, the simultaneous incorporation of multiple elements increases the entropy (S) of PeNCs, thereby enhancing their stability and suppressing lattice defects. The optimized PeLED achieves a maximum external quantum efficiency (EQE) of 22.2%, dramatically surpassing that (14.1%) of the control CsPbBr
3
-based device. More importantly, the device operating lifetime reaches 10 h, 14-fold higher than that of the control LED.
期刊介绍：
IEEE Electron Device Letters publishes original and significant contributions relating to the theory, modeling, design, performance and reliability of electron and ion integrated circuit devices and interconnects, involving insulators, metals, organic materials, micro-plasmas, semiconductors, quantum-effect structures, vacuum devices, and emerging materials with applications in bioelectronics, biomedical electronics, computation, communications, displays, microelectromechanics, imaging, micro-actuators, nanoelectronics, optoelectronics, photovoltaics, power ICs and micro-sensors.
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