Highly Efficient and Stable Cs2TeCl6:Cr3+ Perovskite Microcrystals for White Light Emitting Diodes Hongwei Song, Lu Zi, Wen Xu, Zhijiang Song, Rui Sun, Sen Liu, Tianyu Xie, Jinyang Zhu and Siyu Lu Abstract Lead-free perovskites have aroused great attention in white light emitting diodes (WLEDs), displays, and X-ray imaging etc. However, it still remains a challenge to obtain high photoluminescent quantum yield (PLQY) owing to the intrinsically defect intolerance.