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

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.

Citation

Yang, C., Chen, X., Mao, M., Luo, X., Sheng, W., Lu, Z., Sun, S., He, H., Su, W., & Song, K. (2023). Ionic selective occupation, lattice modulation and photoluminescence properties of garnet typed orange-yellow phosphors for White-Light-Emitting Diodes. Ceramics International, 49(5), 7683-7691. https://doi.org/10.1016/j.ceramint.2022.10.264

• 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