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Ionic selective occupation, lattice modulation and photoluminescence properties of garnet typed orange-yellow phosphors for White-Light-Emitting Diodes

Yang, Chen; Chen, Xinhua; Mao, Minmin; Luo, Xinjiang; Sheng, Weiqin; Lu, Zhilun; Sun, Shikuan; He, Hong; Su, Weitao; Song, Kaixin

Authors

Chen Yang

Xinhua Chen

Minmin Mao

Xinjiang Luo

Weiqin Sheng

Zhilun Lu

Shikuan Sun

Hong He

Weitao Su

Kaixin Song



Abstract

Orange-yellow luminescent Y2-xSr1-yAl4SiO12: xCe3+, yMn2+ (x = 0.04–0.06, y = 0.1–0.6, abbreviated as YSAS: xCe3+, yMn2+) phosphors with garnet structure were prepared by the high temperature solid-phase method. The matrix energy band is calculated by DFT, where YAG is 4.535 eV and YSAS is 4.874 eV. The Rietveld refinement of the XRD data indicates that Ce3+ mainly replaces the Y3+ sites, while Mn2+ selectively occupies. The Gaussian peaks of the fluorescence spectrum prove that Mn2+ occupies two luminescent centers, which are further determined by Van Uitert's empirical formula. The doping of Ce3+/Mn2+ units can effectively enhance the structural rigidity of the YAG host and promote the red-shift of the emission peak position of Mn2+. The fluorescence decay kinetics test proves that Ce3+ can transfer energy to Mn2+, and the transfer efficiency reaches 72.08% at y = 0.5. The thermal stability test of the phosphor shows the luminous intensity at 473 K still maintains 86% of the room temperature. The phosphor prepared in this experiment was combined with a blue light chip to make a w-LED device, and the performance showed Ra = 86.1, CCT = 5168 K. The above results show that the emission color of the garnet structure can be tuned by energy transfer, which is attractive for future applications.

Journal Article Type Article
Acceptance Date Oct 21, 2022
Online Publication Date Oct 29, 2022
Publication Date Mar 1, 2023
Deposit Date Oct 31, 2022
Publicly Available Date Oct 30, 2023
Journal Ceramics International
Print ISSN 0272-8842
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 49
Issue 5
Pages 7683-7691
DOI https://doi.org/10.1016/j.ceramint.2022.10.264
Keywords Garnet structure, Phosphors, Luminescent, w-LED device
Public URL http://researchrepository.napier.ac.uk/Output/2945845

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Ionic selective occupation, lattice modulation and photoluminescence properties of garnet typed orange-yellow phosphors for White-Light-Emitting Diodes (accepted version) (1.5 Mb)
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