Broadband NaK2Li[Li3SiO4]4:Ce Alkali Lithosilicate Blue Phosphors
- 20 August 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 11 (16), 6621-6625
- https://doi.org/10.1021/acs.jpclett.0c02064
Abstract
Phosphors with a rigid and symmetrical structure are urgently needed. The alkali lithosilicate family (A[Li3SiO4]) has been extensively studied with a narrow emission band due to its unique cuboid-coordinated environment and rigid structure. However, here we demonstrate for the first time Ce-doped NaK2Li[Li3SiO4](4) phosphors with a broad emission band, a high internal quantum efficiency (85.6%), and excellent thermal stability. Photoluminescence indicates the Ce's preference to occupy the Na+ site, leading to a strong blue color emission with peak maxima at 417 and 450 nm. Temperature- and pressure-dependent photoluminescence reveals thermal stability and a phase transition. Moreover, the X-ray absorption near-edge structure reveals the mixing of Ce(3+ )and Ce4+ in the materials; this result differs from that of Eu2+-doped A[Li3SiO4] phosphors. The charge compensation process is then proposed to explain this difference. This study not only provides insights into Ce-doped UCr4C4-type phosphors but also explains the charge compensation mechanism of the aliovalent doping process.Funding Information
- Narodowe Centrum Nauki (2016/23/B/ST3/03911, 2019/33/B/ST3/00406)
- Ministry of Science and Technology, Taiwan (MOST 107-2113-M-002-008-MY3, MOST 107-2923-M-002-004-MY3)
- Narodowe Centrum Badań i Rozwoju (PL-TW/V/1/2018)
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