Electronic Structure and Luminescence Properties of Phosphor Li8Bi2(MoO4)7: Dy3+. Issue 6 (21st February 2014)

• Record Type: Journal Article
• Authors: Zhao, Jin; Guo, Chongfeng; Su, Xiangying; Noh, Hyeon Mi; Jeong, Jung Hyun; Srivastava, A.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 6(2014)
• Page Start: 1878
• Page End: 1882
• Publication Date: 2014-02-21
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12863
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12863-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Dy<sup>3+</sup>‐doped Li<sub>8</sub>Bi<sub>2</sub>(MoO<sub>4</sub>)<sub>7</sub> (LBM: Dy<sup>3+</sup>) white‐emitting phosphors have been prepared by sol‐gel method at about 400~550°C low temperature. The electronic structure of Li<sub>8</sub>Bi<sub>2</sub>(MoO<sub>4</sub>)<sub>7</sub> is also calculated using density functional theory. The calculation results show that Li<sub>8</sub>Bi<sub>2</sub>(MoO<sub>4</sub>)<sub>7</sub> has a direct band gap with 2.63 eV, the top of the valence band and the bottom of the conduction band are dominated by O 2<italic>p</italic> and Mo 4<italic>d</italic>, respectively. The effect from Bi<sup>3+</sup> ions is so weak that it could be neglected, which is also be proved by the experimental results. The crystal structure and luminescent properties of the obtained phosphors are characterized by powder X‐ray diffraction and photoluminescence spectrum, respectively. Photoluminescence results showed that the obtained phosphors can be excited efficiently by near‐UV 387 nm and generated white light emission. The yellow/blue ratio and Commission International de I'Eclairage color coordinates could be tuned by adjusting the concentration of Dy<sup>3+</sup>. Results demonstrated that Li<sub>8</sub>Bi<sub>2</sub>(MoO<sub>4</sub>)<sub>7</sub>: Dy<sup>3+</sup> was a potential white light‐emitting phosphor candidate for NUV‐based w‐LEDs.</p> </abstract>