The development of white-light-emitting electrochemical cells (LECs) has attracted great attention owing to their numerous advantages. Recently, perovskite materials have also shown many outstanding optoelectronic properties in light absorption and emission, and hence they are suitable for serving as the color conversion layers (CCLs) in solid-state white-light-emitting diodes (LEDs). Here, white LECs were fabricated by integrating non-doped blue-green LECs with CCLs made of a single composition of perovskite nanocrystal (NCs). Moreover, the correlated color temperatures (CCTs) of the white LECs can be tuned by modifying the optical properties of the perovskite NCs, in the same way as so as the color conversion properties of CCLs are tuned, through laser scan. By controlling the laser power, scanning number, and duty cycle of the scanned grating patterns on perovskite-NC CCLs, the CCTs of the white LECs can be tuned from 2502 K to nearly 4300 K. Since this method is much different from that used with conventional CCLs, which use multiple compositions of perovskite NCs to produce white light, the inherent anion-exchange issue of perovskite NCs can be avoided.

中文翻译：

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通过激光扫描钙钛矿-纳米晶体颜色转换层来调整发白光电化学电池的色温。

白光电化学电池（LEC）的发展由于其众多的优势而引起了极大的关注。近年来，钙钛矿材料在光吸收和发射方面也显示出许多出色的光电性能，因此它们适合用作固态白色发光二极管（LED）中的颜色转换层（CCL）。在这里，白色LEC是通过将未掺杂的蓝绿色LEC与由单一钙钛矿纳米晶体（NCs）组成的CCL集成而成的。此外，可以通过修改钙钛矿NC的光学特性来调整白色LEC的相关色温（CCT），就像通过激光扫描来调整CCL的颜色转换特性一样。通过控制激光功率，扫描次数，