Blue emission from Sr0.98Ga2B2O7: 0.01Bi3+, 0.01Dy3+ phosphor with high quantum yield

• Published in: Journal of alloys and compounds Vol. 810; p. 151849
• Main Authors: Yang, Shuai, Dai, Yannan, Shen, Yang, Duan, Chungang, Rao, Qunli, Peng, Hui, Yang, Fan, Shan, Yongkui, Zhao, Qingbiao
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.11.2019; Elsevier BV
• Subjects: Bismuth; Blue; Borate; Cerium; Chemical synthesis; Dysprosium; Europium; Light emission; Metal ions; Organic chemistry; Oxidation; Phosphors; Quantum yield; Rare earth elements; Bismuth; Borate; Quantum yield; Phosphors; Blue
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.151849

Most of the blue phosphors are based on Eu2+ or Ce3+ doped compounds. The luminescent centers of Eu2+ or Ce3+ generally require reducing environment during synthesis. Also, Eu2+ and Ce3+ are prone to oxidation, causing instability of the phosphors for long-term use. Herein, we report Bi3+ and Dy3+ co-doped SrGa2B2O7 blue phosphors with simpler synthesis conditions and more stable chemical property. In this phosphor, Bi3+ ions emit blue light and, while Dy3+ as sensitizer has no appreciable luminescence emission but can enhance the emission of Bi3+. Co-doping with rare earth ions enhances the emission of Bi3+, improving the efficiency and stability of the phosphor. The Sr0.98Ga2B2O7: 0.01Bi3+, 0.01Dy3+ phosphor exhibits strong blue light emission with absolute quantum yield of 65.54%. Sr0.98Ga2B2O7: 0.01Bi3+, 0.01Dy3+ has a broad excitation band (250–380 nm), emits bright blue light at 430 nm and has a narrow full width at half maxima (FWHM = 64.6 nm) with a color purity of 94.2%. Furthermore, the Sr0.98Ga2B2O7: 0.01Bi3+, 0.01Dy3+ phosphor retains strong blue light emission at high temperatures (95% at 100 °C). Overall, Sr0.98Ga2B2O7: 0.01Bi3+, 0.01Dy3+ is a promising blue emitting phosphor for n-UV WLED. •SrGa2B2O7: 0.01Bi3+, 0.01Dy3+ phosphor exhibits intense blue emission with high absolute quantum yield of 65.54%.•The doping ratios of 1% Bi3+ and 1% Dy3+ are both small.•This phosphor has good thermal stability with 95% maintained at 100 °C.•This phosphor represents a unique case where Bi is the luminescent center and rare earth functions as sensitizer.