State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Nanoscale. 2018 Jan 18;10(3):1023-1029. doi: 10.1039/c7nr08136g.
Colloidal perovskite nanocrystals (NCs), especially the fully inorganic cesium lead halide (CsPbX, X = Cl, Br, I) NCs, have been considered as promising candidates for lighting and display applications due to their narrow band emission, tunable band gap and high photoluminescence quantum yields (QYs). However, owing to the anion exchange in the CsPbX NCs, stable multi-color and white light emissions are difficult to achieve, thus limiting their practical optoelectronic applications. In this work, dual ion Bi/Mn codoped CsPbCl perovskite NCs were prepared through the hot injection method for the first time to the best of our knowledge. Through simply adjusting the doping ion concentrations, the codoped NCs exhibited tunable emissions spanning the wide range of correlated color temperature (CCT) from 19 000 K to 4250 K under UV excitation. This interesting spectroscopic behaviour benefits from efficient energy transfer from the perovskite NC host to the intrinsic energy levels of Bi or Mn doping ions. Finally, taking advantage of the cooperation between the excitonic transition of the CsPbCl perovskite NC host and the intrinsic emissions from Bi and Mn ions, white light emission with the Commission Internationale de l'Eclairage (CIE) color coordinates of (0.33, 0.29) was developed in the codoped CsPbCl NCs.
胶体钙钛矿纳米晶体（NCs），特别是全无机铯铅卤（CsPbX，X = Cl、Br、I）NCs，由于其窄带发射、可调带隙和高光致发光量子产率（QYs），被认为是照明和显示应用的有前途的候选材料。然而，由于 CsPbX NCs 中的阴离子交换，难以实现稳定的多色和白光发射，从而限制了它们的实际光电应用。在这项工作中，我们首次通过热注射法制备了双离子 Bi/Mn 共掺杂 CsPbCl 钙钛矿 NCs。通过简单调整掺杂离子浓度，共掺杂 NCs 在紫外光激发下表现出可调发射，覆盖了相关色温（CCT）的宽范围，从 19000 K 到 4250 K。这种有趣的光谱行为得益于从钙钛矿 NC 主体到 Bi 或 Mn 掺杂离子本征能级的有效能量转移。最后，利用 CsPbCl 钙钛矿 NC 主体的激子跃迁和 Bi 和 Mn 离子的本征发射之间的协同作用，在共掺杂 CsPbCl NCs 中开发了具有国际照明委员会（CIE）颜色坐标为（0.33，0.29）的白光发射。
