White light emitting from YVO4/Y2O3:Eu3+, Bi3+ composite phosphors for UV light-emitting diodes. Issue 6 (July 2015)

• Record Type: Journal Article
• Authors: Wang, Danmian; Tie, Shaolong; Wan, Xia
• Is Part Of: Ceramics international. Volume 41:Issue 6(2015)
• Page Start: 7766
• Page End: 7772
• Publication Date: 2015-07
• Subjects: Luminescence material -- YVO4/Y2O3 composite matrices -- Eu3+/Bi3+ activated ions -- White light-emitting; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.02.109
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A series of (1− x )YVO4 / x Y2 O3 :Eu 3+ 0.006, Bi 3+ 0.006 (0≤ x ≤0.54) composite phosphors was synthesized in one step by high temperature solid state reaction and the photoluminescence properties were investigated. By means of co-doping Eu 3+ and Bi 3+ ions into the composite matrices composed of YVO4 and Y2 O3 crystals, the YVO4 /Y2 O3 :Eu 3+, Bi 3+ phosphor exhibits simultaneously the blue (418 nm), green (540 nm) and orange-red (595, 620 nm) emissions. The broad blue and green emissions are attributed to the 3 P1 – 1 S0 transitions of Bi 3+ ion both in Y2 O3 and in YVO4 matrices. Moreover, the sharp orange-red emissions are attributed to the 5 D0 – 7 F1, 2 transitions of Eu 3+ ion in YVO4 matrix. By tuning the mole ratio of YVO4 /Y2 O3 matrices the white light-emitting could be obtained. The results indicated that when the mole ratio of Y2 O3 ( x ) is at 0.11–0.54 mol, the (1− x )YVO4 / x Y2 O3 :Eu 3+ 0.006, Bi 3+ 0.006 phosphors emit white light by combining the blue, green and orange-red emissions under the excitation of 360–370 nm wavelength which matches the emission of the commercial UV-LED diode. This implies that the phosphors may be the promising white light materials with broad absorption band for white light-emitting diodes.