Energy transfer mechanism and luminescence properties of color tunable LaPO4:Tm, Eu phosphor. Issue 6 (July 2015)

• Record Type: Journal Article
• Authors: Yang, Su-Hua; Yen, Chia-Hung; Lin, Che-Min; Chiang, Po-Jui
• Is Part Of: Ceramics international. Volume 41:Issue 6(2015)
• Page Start: 8211
• Page End: 8215
• Publication Date: 2015-07
• Subjects: Phosphor -- Photoluminescence -- Energy transfer; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.02.042
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The energy transfer mechanism between Tm 3+ and Eu 3+ ions in the phosphate phosphor was investigated. The addition of Eu facilitated the incorporation of O atoms into the LaPO4 :Tm, Eu phosphor lattice, which induced changes in its ligand field and energy absorption. Excitation energy was transferred from Tm 3+ to Eu 3+ ions by the mechanism of dipole–dipole interaction. The increase in Eu concentration increased the probability of energy transfer between Tm 3+ and Eu 3+ as well as the electron transition probabilities in Eu 3+ ; a color-tunable emission was observed through variation in the Eu concentration. The highest energy transfer efficiency of Tm 3+ –Eu 3+ was approximately 93%. The critical distance, for energy transfer, between Tm 3+ and Eu 3+, was 14.5 Å. The luminescence of the phosphor declined with a double-exponential mechanism. The decay time decreased as the Eu doping concentration was increased.