Two-dimensional perovskites have attracted attention as a kind of potential electroluminescence (EL) materials due to their controllable quantum confine effect, but there are still some inadequacies in their EL efficiency and stability. In this work, the enhanced optical and electrical properties of quasi two dimensional organometal halide perovskite (QTDOHP) passivated by poly(ethylene oxide) (PEO) are reported. The introduction of PEO can not only passivate the surface defects of QTDOHP, but also suppress the formation of low luminous efficient single-layered QTDOHP phase. The photoluminescence quantum yields (PLQY) of the composite film has been approximately increased by 350% compared with pure QTDOHP films. The EL devices based on emitting layer (EML) of PEO-QTDOHP composite film have achieved a brightness of up to 41800 cd/m² and a maximal current efficiency of 25.1 cd/A. The EL intensity of the device with PEO dropped to 70% of the initial value after around 7 h under a constant current density of 10 mA/cm², which indicates an excellent device operation stability. The composite film of QTDOHP and PEO would serve as distinct and promising materials for light-emitting diode application.

二维钙钛矿由于其可控的量子限制效应而作为一种潜在的电致发光（EL）材料备受关注，但其EL效率和稳定性仍存在不足之处。在这项工作中，报道了通过聚环氧乙烷（PEO）钝化的准二维有机金属卤化物钙钛矿（QTDOHP）的增强的光学和电学性质。PEO的引入不仅可以钝化QTDOHP的表面缺陷，而且可以抑制低发光高效单层QTDOHP相的形成。与纯QTDOHP薄膜相比，复合薄膜的光致发光量子产率（PLQY）大约提高了350％。基于PEO-QTDOHP复合膜发射层（EML）的EL器件实现了高达41800 cd / m的亮度²，最大电流效率为25.1 cd / A。在10 mA / cm ²的恒定电流密度下，经过7小时后，带有PEO的器件的EL强度降至初始值的70％，这表明器件具有出色的操作稳定性。QTDOHP和PEO的复合膜将作为发光二极管应用的独特和有前途的材料。