Pure Red Light-Emitting Diodes Based on Quantum Confined Quasi-Two-Dimensional Perovskites with Cospacer Cations,ACS Energy Letters

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Pure Red Light-Emitting Diodes Based on Quantum Confined Quasi-Two-Dimensional Perovskites with Cospacer Cations
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-06-07 , DOI: 10.1021/acsenergylett.1c00752
Lvpeng Yang ₁ , Yun Zhang ₁ , Junming Ma ₁ , Ping Chen ₂ , Yu Yu ₁ , Ming Shao ₁

Affiliation

Efficient and spectrally stable pure-red perovskite light-emitting diodes (PeLEDs) are still rare and urgently needed for high-definition display. The traditional color tuning method by varying halide composition undergoes phase segregation and has spectral instability issues. Instead of halide mixing, we fabricate pure-red PeLEDs based on quasi-two-dimensional (quasi-2D) perovskites by simultaneously incorporating phenethylammonium (PEA) and 1-naphthylmethylammonium (NMA) cations. The control of PEA and NMA cospacer ratio modulates the phase distribution and the resulting different color emission. The PeLEDs with PEA:NMA molar ratio of 5:5 exhibit a pure-red (635 nm) electroluminescence (EL) with a CIE coordinate (0.709, 0.285) approaching the Rec. 2020 specification. Meanwhile, the optimized devices exhibit an external quantum efficiency (EQE) of 12.41% and a maximum brightness of 1452.6 cd m^–2, which are among the best-performing pure-red PeLEDs based on quasi-2D perovskite to date. Additionally, our PeLEDs demonstrate stable EL spectra under different operating voltages and continuous operation.

中文翻译：

基于具有共间隔阳离子的量子限制准二维钙钛矿的纯红光发光二极管

高效且光谱稳定的纯红色钙钛矿发光二极管 (PeLED) 仍然很少见，并且迫切需要用于高清显示。通过改变卤化物成分的传统颜色调谐方法会发生相分离并存在光谱不稳定问题。我们不是卤化物混合，而是通过同时掺入苯乙基铵 (PEA) 和 1-萘基甲基铵 (NMA) 阳离子来制造基于准二维（准 2D）钙钛矿的纯红色 PeLED。PEA 和 NMA 共间隔比的控制调节相位分布和由此产生的不同颜色发射。PEA:NMA 摩尔比为 5:5 的 PeLED 表现出纯红色 (635 nm) 电致发光 (EL)，其 CIE 坐标 (0.709, 0.285) 接近 Rec。2020 规格。同时，^–2，它们是迄今为止基于准二维钙钛矿的性能最佳的纯红色 PeLED 之一。此外，我们的 PeLED 在不同的工作电压和连续工作下表现出稳定的 EL 光谱。

更新日期：2021-07-09

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