Efficient pure green light-emitting diodes based on formamidinium lead bromide perovskite nanocrystals
Efficient pure green light-emitting diodes based on formamidinium lead bromide perovskite nanocrystals
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DOI：
10.1016/j.orgel.2018.05.034
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发表时间：
2018-09-01
影响因子：
3.2
通讯作者：
Wang, Lei
中科院分区：
文献类型：
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作者：
Fan, Lianwei;Ding, Ke;Wang, Lei
甲醛(FA)溴化铅(FAPbBr3)钙钛矿纳米晶(P-NCS)具有超纯的绿色发射和高稳定性，而基于FAPbBr3的纳米晶发光二极管(FA-NLED)的报道还很少。合成了光致发光量子产率为85.8%的FAPbBr(3)NCS。通过控制FAPbBr(3)NCS在甲苯溶液中的浓度，激子复合区域被精确地限制在发射层，来自电子传输层的寄生发射消失，从而获得纯绿色发射。优化后的FA-NLED的最大外量子效率和电流效率分别为3.84%和16.08cd/A，EL发射峰为528 nm，CIE为(0.183，0.763)，半高宽为24 nm，是FA-NLED性能最好的器件之一。
Formamidinium (FA) lead bromide (FAPbBr(3)) perovskite nanocrystals (P-NCs) have ultrapure green emission and high stability, while FAPbBr(3) NCs based light-emitting diodes (FA-NLEDs) still have little report. Here, FAPbBr(3) NCs with a high photoluminescence quantum yield of 85.8% were synthesized. By controlling the concentration of FAPbBr(3) NCs in toluene solution, the exciton recombination region was precisely confined to the emitting layer and the parasitic emission coming from electron transport layer disappeared, resulting in the pure green emissions. The optimized FA-NLED presents a maximum external quantum efficiency (EQE), current efficiency (CE) of 3.84% and 16.08 cd/A respectively, with the EL emission peak of 528 nm, CIE of (0.183, 0.763) and a full width of half-maximum (FWHM) of 24 nm, which is among the best performance of FA-NLEDs.