Yuan Fang, Zhang Min, Zhu Chunrong, Liu Xiaoyun, Zhao Chenjing, Dai Jinfei, Dong Hua, Jiao Bo, Lan Xuguang, Wu Zhaoxin
Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China.
Institute of Artificial Intelligence and Robotics, Xi'an Jiaotong University, Xi'an, China.
Front Chem. 2022 Jan 21;10:828322. doi: 10.3389/fchem.2022.828322. eCollection 2022.
Recently, perovskite light-emitting diodes (PeLEDs) have drew widespread attention due to their high efficiencies. However, because of the sensitivity to moisture and oxygen, perovskite luminescent layers are usually prepared in high-purity nitrogen environment, which increases the cost and process complexity of device preparation and seriously hindrances its commercialization of PeLED in lighting and display application. Herein, dual-phase all-inorganic composite CsPbBr-CsPbBr films are fabricated from CsBr-rich perovskite solutions by a simple one-step spin-coating method in the air with high humidity. Compared with the pure CsPbBr film, the composite CsPbBr-CsPbBr film has much stronger photoluminescence emission and longer fluorescence lifetime, accompanied by increased photoluminescence quantum yield (33%). As a result, we obtained green PeLED devices without hole transport layer exhibiting a maximum brightness of 72,082 cd/m and a maximum external quantum efficiency of about 2.45%, respectively. More importantly, the champion device shows excellent stability with operational half-lifetime exceeding 1,000 min under continuous operation in the air. The dual-phase all-inorganic composite CsPbBr-CsPbBr film shows attractive prospect for advanced light emission applications.
最近，钙钛矿发光二极管（PeLEDs）因其高效率而受到广泛关注。然而，由于对水分和氧气敏感，钙钛矿发光层通常在高纯度氮气环境中制备，这增加了器件制备的成本和工艺复杂性，并严重阻碍了其在照明和显示应用中的商业化。在此，通过简单的一步旋涂法，在高湿度空气中由富CsBr的钙钛矿溶液制备了双相全无机复合CsPbBr₃-CsPbBr₂薄膜。与纯CsPbBr₃薄膜相比，复合CsPbBr₃-CsPbBr₂薄膜具有更强的光致发光发射和更长的荧光寿命，同时光致发光量子产率提高了33%。结果，我们获得了无空穴传输层的绿色PeLED器件，其最大亮度分别为72,082 cd/m²和最大外量子效率约为2.45%。更重要的是，冠军器件表现出优异的稳定性，在空气中连续运行时的工作半衰期超过1000分钟。双相全无机复合CsPbBr₃-CsPbBr₂薄膜在先进发光应用中显示出诱人的前景。
