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Eu2+ Site Preferences in the Mixed Cation K2BaCa(PO4)2 and Thermally Stable Luminescence
Abstract
Site preferences of dopant Eu 2+ on the locations of K +, Ba 2+, and Ca 2+ in the mixed cation phosphate K 2 BaCa(PO 4 ) 2 (KBCP) are quantitatively analyzed via a combined experimental and theoretical method to develop a blue-emitting phosphor with thermally stable luminescence. Eu 2+ ions are located at K2 (M2) and K3 (M3) sites of KBCP, with the latter occupation relatively more stable than the former, corresponding to emissions at 438 and 465 nm, respectively. KBCP:Eu 2+ phosphor exhibits highly thermal stable luminescence even up to 200 °C, which is interpreted as due to a balance between thermal ionization and recombination of Eu 2+ 5d excited-state centers with the involvement of electrons trapped at crystal defect levels. Our results can initiate more exploration of activator site engineering in phosphors and therefore allow predictive control of photoluminescence tuning and thermally stable luminescence for emerging applications in white LEDs.
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Cites
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
Kresse, G., & Furthmüller, J. (1996) · Physical Review B · doi:10.1103/physrevb.54.11169 · Cited by 123,652
Projector augmented-wave method
Blöchl, P. E. (1994) · Physical Review B · doi:10.1103/physrevb.50.17953 · Cited by 92,732
From ultrasoft pseudopotentials to the projector augmented-wave method
Kresse, G., & Joubert, D. (1999) · Physical Review B · doi:10.1103/physrevb.59.1758 · Cited by 85,307
Cited by
Optical temperature sensing of up-conversion luminescent materials: Fundamentals and progress
Zhao, Y., Wang, X., Zhang, Y., Li, Y., & Yao, X. (2020) · Journal of Alloys and Compounds · doi:10.1016/j.jallcom.2019.152691 · Cited by 380
Metadata
- Authors
- Qiao, J., Ning, L., Molokeev, M. S., Chuang, Y.-C., Liu, Q., & Xia, Z.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-07-09
- Volume
- 140
- Issue
- 30
- Pages
- 9730-9736
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2852071000
- Cited by
- 577
- References
- 3
- FWCI
- 24.04
- Type
- journal article
- Language
- en
- Open access
- closed
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- Qiao, J., Ning, L., Molokeev, M. S., Chuang, Y.-C., Liu, Q., & Xia, Z. (2018). Eu2+ Site Preferences in the Mixed Cation K2BaCa(PO4)2 and Thermally Stable Luminescence. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.8b06021
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