Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 37, Pages 9243-9246Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201802056
Keywords
layered; light-emitting material; perovskite; photoluminescence; white light
Categories
Funding
- NSFC [21571178, 21525104, 21601188, 51502288]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB20000000]
- Youth Innovation Promotion of CAS [2015240, 2016274]
- NSF for Distinguished Young Scholars of Fujian Province [2016J06012]
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Most of single-component white-light-emitting materials focus on organic-inorganic hybrid perovskites, metal-organic frameworks, as well as all-inorganic semiconductors. In this work, we successfully assembled an all-inorganic layered perovskite by mixing two halogens of distinct ionic radii, namely, Rb2CdCl2I2, which emits warm white light with a high color rendering index of 88. To date, Rb2CdCl2I2 is the first single-component white-light-emitting material with an all-inorganic layered perovskite structure. Furthermore, Rb2CdCl2I2 is thermally highly stable up to 575K. A series of luminescence measurements show that the white-light emission arises from the lattice deformation, which are closely related to the [CdCl4I2](2-) octahedra with high distortion from the distinct ionic radii of Cl and I. The first-principles calculations reveal that both the Cl and I components make significant contributions to the electronic band structures of Rb2CdCl2I2. These findings indicate that mixing halogens is an effective route to design and synthesize new single-component white-light-emitting materials.
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