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Abstract

Perovskite light emitting diodes (PeLEDs) have developed rapidly in recent years due to their advantages of tenability of band gap and high color purity. At present, the external quantum efficiency of PeLED has rised up to 20%. Like the scenario of organic light emitting diode, there exist various internal losses in PeLED with low light extraction efficiency. It arises from the absorption of substrates, waveguide transmission and surface plasmon resonance of metal electrode. To improve the luminescence performance of PeLED, a well-matched optical admittance between the thin-films inside the devices is required. In this paper, the strategies of enhancing the light extraction efficiency are adopted as the materials and structures in PeLED are concerned. The applications of alternative electrode in PeLED are discussed, such as graphene, silver nanowires, metal transparent electrode and some new-types of electrodes. In addition, the plasma effect is also introduced into the PeLED to deflect the emitting light. What is more, the nano-structure grating is inserted into device to reduce the optical losses due to the large refractive index difference between the interfaces in device. Therefore, the external quantum efficiency of PeLED rises up to 28.2%, and the current efficiency can reach 88.7 cd/A.

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Corresponding author:Li Guo-Long,liglo@163.com

Funds:Project supported by the National Natural Science Foundation of Ningxia, China (Grant No. 2019AAC03001)

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发表时间	器件结构	光提取方法	CE_max/cd·A^–1	EQE_max/%	最大亮度/cd·m^–2	寿命参数T50	参考文献
2017	4LG/Buf-HIL/MAPbBr₃/TPBi/LiF/Al	电极	18.0	3.8	13000	—	[25]
2018	Ag/(ZnO/PEI)/CsPbI₃NC /TCTA/(MoO₃/Au/MoO₃)	电极	—	11.2	1106	—	[26]
2018	Au/HIL/MAPbBr₃/TPBi/LiF/AL	电极	3.3	—	11270	—	[27]
2019	m-ZAgZ/HAT-CN/TAPC/CsPbBr₃/TPBi/Liq/Al	电极	7.21	—	4846	—	[28]
2018	Glass/AnoHIL/MAPbBr₃/TPBi/Li/AL	电极	42	8.66	—	—	[29]
2020	Glass/Au/ZnO/MQW perovskite/ TFB/MoO₃/Au	电极微腔	—	20.2	—	—	[31]
2017	Glass/ITO/PEDOT:PSS/(Agrods NPB)/ CsPbBr₃NC/TPBi/LiF/Al	激元	1.42	0.43	8911	—	[33]
2017	Au NPs/PVK:MAPbBr₃:TPBi/ TPBi/Cs₂CO₃/Al	激元	7.64	1.83	16050	—	[34]
2019	Glass/NHAs/ITO/Poly-TPD/MAPbI₃/TPBi/LiF/Al	微纳	—	0.012	0.53 W·sr^–1·m^–2	—	[36]
2019	Glass/Epoxy/AAM(TiO₂)/ITO/PEDOT:PSS/ BA: CH₃NH₃PbBr₃/F₈/Ca/Ag	微纳	—	17.5	48668	120 s	[38]
2019	Glass/ITO/ZnO/PEDOT:PSS/ CsPbBr₃/TPBi/LiF/Al	微纳	88.7	28.2	～25000	—	[12]
2018	Glass/ITO/ZnO/ZnO-PEIE/ FAPbI₃/TFB/MoO_x/Au	薄膜形貌	—	20.7	390 W·sr^–1· m^–2	20 h	[11]
2020	Glass/ITO/ PEDOT:PSS/Perovskite/ B₃PyMPM/LiF/Al	器件结构	—	17.6	79700	—	[39]

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Vol. 69, Issue 21 - 2020-11-05

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