Sr2+ doped CsPbBrI2 perovskite nanocrystals coated with ZrO2 for applications as white LEDs. (2nd July 2023)

• Record Type: Journal Article
• Authors: Padhiar, Muhammad Amin; Ji, Yongqiang; Wang, Minqiang; Pan, Shusheng; Ali khan, Sayed; Khan, Noor Zamin; Zhao, Lei; Qin, Fangrong; Zhao, Zhuan; Zhang, Shaolin
• Is Part Of: Nanotechnology. Volume 34:Number 27(2023)
• Publication Date: 2023-07-02
• Subjects: all-inorganic perovskite nanocrystals -- doping -- coating -- ion leakage; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/acc9cc
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: 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 ZrO2 coated, Sr 2+ doped CsPbBrI2 NCs. Introducing divalent Sr 2+ may significantly eliminate Pb° surface traps, whereas ZrO2 encapsulation greatly improves environmental stability. The photoluminescence quantum yield of the Sr 2+ -doped CsPbBrI2 /ZrO2 NCs 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 ZrO2 thin coating gives remarkable heat resistance and improved water stability. Combining CsPbSr0.3 BrI2 /ZrO2 NCs in a white light emitting diode (LED) with an excellent optical efficiency (100.08 lm W −1 ), high and a broad gamut 141% (NTSC) standard. This work offers a potential method to suppress Pb° traps by doping with Sr 2+ and improves the performance of perovskite NCs by ultrathin coating structured ZrO2, consequently enabling their applicability in commercial optical displays.