Srdoped CsPbBrIperovskite nanocrystals coated with ZrOfor applications as white LEDs.

Perovskite nanocrystals (NCs) feature adjustable bandgap, wide absorption range, and great color purity for robust perovskite optoelectronic applications. Nevertheless, the absence of lasting stability under continues energization, is still a major hurdle to the widespread use of NCs in commercial applications. In particular, the reactivity of red-emitting perovskites to environmental surroundings is more sensitive than that of their green counterparts. Here, we present a simple synthesis of ultrathin ZrOcoated, Srdoped CsPbBrINCs. Introducing divalent Srmay significantly eliminate Pb° surface traps, whereas ZrOencapsulation greatly improves environmental stability. The photoluminescence quantum yield of the Sr-doped CsPbBrI/ZrONCs was increased from 50.2% to 87.2% as a direct consequence of the efficient elimination of Pb° surface defects. Moreover, the thickness of the ZrOthin coating gives remarkable heat resistance and improved water stability. Combining CsPbSrBrI/ZrONCs in a white light emitting diode (LED) with an excellent optical efficiency (100.08 lm W), high and a broad gamut 141% (NTSC) standard. This work offers a potential method to suppress Pb° traps by doping with Srand improves the performance of perovskite NCs by ultrathin coating structured ZrO, consequently enabling their applicability in commercial optical displays.