期刊
CHEMISTRY OF MATERIALS
卷 32, 期 12, 页码 5118-5124出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c01004
关键词
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资金
- European Union through Horizon 2020 (ERC Consolidator Grant SCALE-HALO) [819740]
- ETH Zurich (ETH + Project SynMatLab)
- EMPAPOSTDOCS-II program from the European Union's Horizon 2020 Research and Innovation Program under the Marie Sklodowska-Curie grant [754364]
The vast structural and compositional space of metal halides has recently become a major research focus for designing inexpensive and versatile light sources; in particular, for applications in displays, solid-state lighting, lasing, etc. Compounds with isolated ns(2)-metal halide centers often exhibit bright broadband emission that stems from self-trapped excitons (STEs). The Sb(III) halides are attractive STE emitters due to their low toxicity and oxidative stability; however, coupling these features with an appropriately robust, fully inorganic material containing Sb3+ in an octahedral halide environment has proven to be a challenge. Here, we investigate Sb3+ as a dopant in a solution-grown metal halide double perovskite (DP) matrix, namely Cs2MInCl6:xSb (M = Na, K, x = 0-100%). Cs2KInCl6 is found to crystallize in the tetragonal DP phase, unlike Cs2NaInCl6 that adopts the traditional cubic DP structure. This structural difference results in distinct emission colors, as Cs2NaInCl6:xSb and Cs2KInCl6:xSb compounds exhibit broadband blue and green emissions, respectively, with photoluminescence quantum yields (PLQYs) of up to 93%. Spectroscopic and computational investigations confirm that this efficient emission originates from Sb(III)-hosted STEs. These fully inorganic DP compounds demonstrate that Sb(III) can be incorporated as a bright emissive center for stable lighting applications.
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