Synthesis and luminescence properties of Mn3+, Bi3+ co-doped Y6WO12 for blue phosphor

• Published in: Rare metals 2018-05, Vol.37 (5), p.439-446
• Main Authors: You, Jun-Hua, Wang, Ren-Chao, Han, Fei, Guo, Rui, Liu, Xuan-Wen
• Format: Article
• Language: English
• Subjects: Biomaterials; Charge transfer; Chemistry and Materials Science; Emission; Energy; Energy levels; Luminescence; Luminous intensity; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Optical properties; Phosphors; Physical Chemistry
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-018-1039-5

Mn 3+ and Bi 3+ co-doped Y 6 WO 12 samples with hexagonal structure were synthesized via an improved salt pyrogenation method at a temperature region of 700–1100 °C for 3 h. In Y 6 WO 12 , Mn 3+ , substituting Y 3+ , occupies a seven-coordination site and its energy levels are treated in near O h symmetry. The samples doped by Mn 3+ alone emit the most intensive blue light at 420 nm under excitation at 247 nm due to charge transition (CT). The mechanism of sensitization of Bi 3+ for Y 6 WO 12 :Mn 3+ was also analyzed by taking account of metal-to-metal charge-transfer (MMCT) from Bi 3+ to Mn 3+ . As a consequence, the phosphor Y 6 WO 12 :Mn 3+ /Bi 3+ can emit blue light under radiation of 370 nm, and the emission intensity is enhanced about five times by the sensitizer Bi 3+ . The optimal doping concentration of Bi 3+ is determined as 1 at% for the emission at 420 nm in Y 6 WO 12 :0.5 at% Mn 3+ phosphors.