Figure | Design and fabrication of Mg2Al4Si5O18:Eu2+ composite phosphor, and properties of the laser-driven device. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | Design and fabrication of Mg2Al4Si5O18:Eu2+ composite phosphor, and properties of the laser-driven device.

Caption

(a), MgO-Al2O3-SiO2 ternary glass phase diagram, showing the glass chemical composition situates at cordierite (chemical formula of Mg2Al4Si5O18) region. (b), XRD patterns of glass and glass crystallized phosphor. Broad XRD scattering together without any diffraction peaks confirm amorphous structure of network of the glass, sharp diffraction peaks indexed to cordierite appear after glass crystallization. (c), Photographs of Mg2Al4Si5O18:Eu2+ composite phosphor taken under daylight and blue light irradiation. (d), PLE and PL spectra of Mg2Al4Si5O18:Eu2+ composite phosphor, the inset shows the photograph taken under UV light irradiation. (e), Power-density dependent emission spectra of the laser-driven red-emitting device fabricated by coupling Mg2Al4Si5O18:Eu2+ composite phosphor with 445 nm blue laser, showing emission intensity increase with the incident power-density. (f), Power-density dependent luminous flux and luminous efficiency of the laser-driven red-emitting device. The laser saturation threshold is 3.25 W mm-2, the highest luminous flux and luminous efficiency are 274 lm and 54 lm W-1, respectively.

Credit

by Tao Hu, Lixin Ning, Yan Gao, Jianwei Qiao, Enhai Song, Zitao Chen, Yayun Zhou, Jing Wang, Maxim S. Molokeev, Yu-Chun Chuang, Xiaoxing Ke, Zhiguo Xia and Qinyuan Zhang

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