Halogen‐Hot‐Injection Synthesis of Mn‐Doped CsPb(Cl/Br)3 Nanocrystals with Blue/Orange Dual‐Color Luminescence and High Photoluminescence Quantum Yield. Issue 23 (9th September 2019)

• Record Type: Journal Article
• Authors: Chen, Daqin; Zhou, Su; Tian, Feifan; Ke, Haitao; Jiang, Naizhong; Wang, Shujin; Peng, Yongzhao; Liu, Yue
• Is Part Of: Advanced optical materials. Volume 7:Issue 23(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-09
• Subjects: doping -- luminescence -- optical materials -- perovskites -- white light‐emitting diodes; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201901082
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Recently, Mn 2+ ‐doped CsPb(Cl/Br)3 perovskite nanocrystals (NCs), showing the advantages of dual‐color emissions via exciton‐to‐dopant energy transfer and reduced usage of toxic Pb 2+ heavy metal ions by nontoxic Mn 2+ substitution, are widely explored. However, photoluminescence quantum yields (PLQYs) for Mn 2+ ‐doped CsPb(Cl/Br)3 NCs still need to be further improved. Here, a halogen‐hot‐injection strategy is developed to prepare Mn:CsPb(Cl0.6 Br0.4 )3 NCs with the maximal PLQY of 65%. With this method, intense blue narrowband emission from excitonic recombination and orange broadband emission from Mn 2+ 4 T1 → 6 A1 transition can be simultaneously achieved. The competitive luminescence between perovskite NCs and Mn 2+ dopants is systematically investigated by controlling the injected halogen types and ratios. As a proof‐of‐concept experiment, the present Mn 2+ ‐doped CsPb(Cl/Br)3 perovskite NCs with highly efficient dual‐color emissions are demonstrated to be applicable as color converter in UV‐excitable solid‐state lighting. Abstract : A halogen‐hot‐injection method is developed to fabricate Mn(II)‐doped CsPbX3 (X = Cl, Br, I) perovskite nanocrystals. This strategy alleviates the demanding limit for Mn precursor and produces Mn:CsPb(Cl0.6 Br0.4 )3 with dual‐color luminescence and high photoluminescence quantum yield of 65%. A prototype all‐perovskite light‐emitting diode device is constructed by coupling CsPb(Cl/Br)3 and CsPbBr3 with UV chips to yield white light with desirable optoelectronic performance.