Phase Control and In Situ Passivation of Quasi-2D Metal Halide Perovskites for Spectrally Stable Blue Light-Emitting Diodes.,ACS Applied Materials & Interfaces

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Phase Control and In Situ Passivation of Quasi-2D Metal Halide Perovskites for Spectrally Stable Blue Light-Emitting Diodes.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-10 , DOI: 10.1021/acsami.0c12451
Michael Worku ₁ , Qingquan He ₂ , Liang-Jin Xu ₂ , Jisook Hong ₃ , Ruo Xi Yang ₃ , Liang Z Tan ₃ , Biwu Ma _{1,

2}

Affiliation

The fabrication of efficient and spectrally stable pure-blue perovskite light-emitting diodes (LEDs) has been elusive and remains of great interest. Herein, we incorporate diammonium salts into quasi-2D perovskite precursors for phase control of multiple quantum well structures to yield tunable and efficient emission in the blue region. With detailed characterizations and computational studies, we show that in situ passivation by the diammonium salts effectively modifies the surface energies of quasi-2D phases and inhibits the growth of low-band gap quasi-2D and 3D phases. Such phase control and in situ passivation could afford blue light-emitting perovskite thin films with high photoluminescence quantum efficiencies of, for instance, 75% for the emission peak at 471 nm. Using this perovskite thin film as an emitting layer, spectrally stable pure-blue LEDs with an emission peak at 474 nm and a full width at half-maximum of 26 nm could be fabricated to exhibit a brightness of 290 cd m^–2 at 8 V and an external quantum efficiency of 2.17%.

中文翻译：

用于光谱稳定的蓝色发光二极管的准2D金属卤化物钙钛矿的相控和原位钝化。

高效且光谱稳定的纯蓝色钙钛矿发光二极管（LED）的制造一直难以捉摸，并且仍然引起人们极大的兴趣。在本文中，我们将二铵盐掺入准2D钙钛矿前体中，以进行多个量子阱结构的相控制，从而在蓝色区域产生可调谐且有效的发射。通过详细的特性描述和计算研究，我们显示了二铵盐的原位钝化有效地修饰了准2D相的表面能，并抑制了低带隙准2D和3D相的生长。这种相控制和原位钝化可提供具有高光致发光量子效率的蓝色发光钙钛矿薄膜，例如对于471nm处的发射峰，其具有75％的高效率。使用该钙钛矿薄膜作为发光层，在8 V时为^–2，外部量子效率为2.17％。

更新日期：2020-10-07

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