Although organometal halide perovskites are emerging as emitters with extremely high color purity and low cost, device performances are significantly restricted by poor morphology of the perovskite layer. In this work, a multi-step spin-coating method is used to prepare CH₃NH₃PbBr₃ perovskite layer, which a dense and uniform perovskite film with small grain sizes and a ∼100% coverage. Moreover, the component of the hole injection layer poly(3,4-ethylenedioxythio- phene):poly(4-styrenesulphonate) (PEDOT:PSS) adjusted with PSS is applied to reduce the injection barrier between PEDOT:PSS and perovskite layer. With above-mentioned approaches, efficient perovskite light-emitting diodes with maximum luminance and current efficiency of 9900 cd m⁻² and 2.6 cd A⁻¹ are eventually acquired.

尽管有机金属卤化物钙钛矿正以极高的色纯度和低成本作为发光体出现，但器件性能受到钙钛矿层不良形貌的显着限制。在这项工作中，采用多步旋涂法来制备CH ₃ NH ₃ PbBr ₃钙钛矿层，该层是致密且均匀的钙钛矿膜，具有较小的晶粒尺寸和约100％的覆盖率。此外，用PSS调节的空穴注入层聚（3,4-乙撑二氧噻吩）：聚（4-苯乙烯磺酸酯）（PEDOT：PSS）的成分可减少PEDOT：PSS与钙钛矿层之间的注入势垒。通过上述方法，有效的钙钛矿发光二极管的最大亮度和电流效率为9900 cd m ^-2最终获得2.6 cd A ^-1。