In this paper, a controllable one-step doping method has been successfully adopted in the cesium copper iodide perovskite’s luminescence, a high-quality white-light emission with Commission Internationale de l´Eclairage (CIE) coordinates of (0.3397, 0.3325), and a color rendering index (CRI) reaching up to 90 was realized in a convenient way. Through adding impurities into the ${\mathrm{Cs}}_3{\mathrm{Cu}}_2{\mathrm{I}}_5$ system, high efficiency and stable ${\mathrm{CsCu}}_2{\mathrm{I}}_3$ was synthesized, and the coexistence of varied high luminescence phases realized the white lighting. Strikingly, blue-emitting ${\mathrm{Cs}}_3{\mathrm{Cu}}_2{\mathrm{I}}_5$ and yellow-emitting ${\mathrm{CsCu}}_2{\mathrm{I}}_3$ could coexist, and their respective luminescence was not interacted in the compound, which was beneficial for acquiring a single emission and highly efficient white lighting. This work carried out a deep exploration of the Cu-based metal halides, and would be favorable to the applications of lead-free perovskites.

中文翻译：

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可控的一步掺杂合成法用于碘化铯碘化铜钙钛矿的白光发射

在本文中，成功地将可控的一步掺杂方法成功地应用于了碘化铯铜钙钛矿的发光，具有国际照明委员会（CIE）坐标为（0.3397，0.3325）的高质量白光发射，以及便捷的方式实现了高达90的显色指数（CRI）。通过将杂质添加到${\mathrm{CS}}_3{铜}_{\mathrm{2个}}{\mathrm{一世}}_5$ 系统高效稳定 ${\mathrm{铜铜}}_{\mathrm{2个}}{\mathrm{一世}}_3$合成后，各种高发光相并存，实现了白色照明。令人惊讶的是，发蓝光${\mathrm{CS}}_3{铜}_{\mathrm{2个}}{\mathrm{一世}}_5$ 和发黄光 ${\mathrm{铜铜}}_{\mathrm{2个}}{\mathrm{一世}}_3$可以共存，并且它们各自的发光在化合物中不相互作用，这对于获取单一发射和高效白光是有利的。这项工作对铜基金属卤化物进行了深入的探索，将有利于无铅钙钛矿的应用。