Li doping effect on the photoluminescence behaviors of KSrPO4:Dy3+ phosphors for WLED light. (April 2015)

• Record Type: Journal Article
• Authors: Gou, Jing; Wang, Jing; Yu, Binxun; Duan, Dongyu; Ye, Shufen; Liu, Shengzhong
• Is Part Of: Materials research bulletin. Volume 64(2015:Apr.)
• Page Start: 364
• Page End: 369
• Publication Date: 2015-04
• Subjects: D. Luminescence -- D. Phosphors -- A. Optical materials -- D. Optical properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2015.01.005
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: The luminescence intensity of KSrPO4 :Dy 3+ can be increased with Li + ions co-doping. The mechanisms for the emitting enhancement with Li + ions co-doping were investigated. The thermal stability demonstrated that KSrPO4 :0.01Dy 3+, 0.06Li + is suitable for WLEDs. The chromaticity coordinates of KSrPO4 :Dy 3+, Li + can be tuned with Li + ions increasing. Abstract: A novel warm-white phosphor KSrPO4 co-doped with Dy 3+ and Li + ions was prepared by solid state reaction. A strategy of Li + doping was used with the aim of enhancing the luminescence of 475 nm and 570 nm emission bands under NUV excitation. Compared to lithium-free KSrPO4 :Dy 3+, the intensities of the 570 nm emission peaks were increased by 4.32 times and 2.84 times excited by 351 nm and 388 nm with 6 mol% Li + ions co-doping, respectively. The mechanism of the enhancement was discussed, that is due to the improvement of the phosphors' crystallinity and charge compensation when the Li + ions were introduced. Furthermore, the thermal stability of KSrPO4 :0.01Dy 3+, 0.06Li + was measured and discussed, demonstrating it can be applied for high-powered LED. And the chromaticity coordinates of KSrPO4 :0.01Dy 3+, x Li + can be tuned efficiently from the cold-white region to warm-white region with Li + ions increasing, presenting its potential applied value as a new warm-white LED phosphor.