Preparation and Photoluminescence Properties of Fluorophosphate Glasses with High Efficient White Light Emission
ZHENG Jia-jin1, 2, LU Qiang1, ZHENG Rui-lin1, ZOU Hui1, YU Ke-han1, WEI Wei1
1. College of Electronic and Optical Engineering, Nanjing University of Posts & Telecommunications, Nanjing 210023, China
2. State Key Laboratory of Transient Optics and Photonics of Chinese Academy of Sciences, Xi’an 710119, China
Abstract:A series of Sn2+, Dy3+ and Sn2+-Dy3+ co-doped fluorophosphate glasses (FPGs) for white light emitting phosphor have been prepared by the melt quenching method. Under the UV light excitation, FPG: Sn2+ and FPG∶Dy3+ can obtain blue and yellow light, respectively. The emission color of FPG∶Sn2+-Dy3+ can be tuned from blue to white color by properly adjusting the concentration of Dy3+ ions under the excitation of 280 nm UV light, which can be attributed to the energy transfer from Sn2+ to Dy3+ ions. The energy transfer mechanism was investigated and analyzed according to the photoluminescence, lifetime decay and CIE chromaticity coordinate. In addition, the FPG∶Sn2+fluorophosphate glass shows the highest color rendering index of 94 and the quantum efficiency of 81.3%, and the Sn2+-Dy3+ co-doped fluorophosphate glasses show better white color coordinates. By controlling the concentration of Dy3+, the FPGs can present a white light with a CIE chromaticity coordinate of (0.311, 0.330), which is very close to the equal energy point. The corresponding quantum efficiency and the luminance are 56.3% and 6 706 cd·m-2, respectively. The results of this study demonstrate that the FPGs are promising candidate for commercial white light emitting applications.
Key words:Fluorophosphate glass; White light emitting phosphor; Ions doping; Energy transfer
[1] Hamzaoui M, Soltani M T, Baazouzi M, et al. Physica Status Solidi, 2012, 249: 2213.
[2] Fan B, Xue B, Zhang X, et al. Optics Letters, 2013, 38: 2280.
[3] Sun C Y, Wang X L, Zhang X, et al. Nature Communications, 2013, 4: 2717.
[4] Babu B H, Kumar V V R K. Journal of Materials Science, 2014, 49: 415.
[5] Messing G L, Zhang S C, Jayanthi G V. Journal of the American Ceramic Society, 1993, 76: 2707.
[6] Yu Y, Liu Z, Dai N, et al. Optics Express, 2011, 19: 19473.
[7] Samsudin N F, Matori K A, Wahab Z A, et al. Optik-International Journal for Light and Electron Optics, 2016, 127: 8076.
[8] Kumar M V S, Rajesh D, Balakrishna A, et al. Journal of Molecular Structure, 2013, 1041: 100.
[9] Yuan Y, Zheng R, Lu Q, et al. Optics Letters, 2016, 41: 3122.
[10] Vincent A C, Scott P. Journal of Cosmology & Astroparticle Physics, 2014,(4): 19.
[11] Babu P, Jang K H, Rao C, et al. Optics Express, 2011, 19(3): 1836.
[12] Kesavulu C R, Jayasankar C K. Materials Chemistry & Physics, 2011, 130(3): 1078.
[13] Okamoto H, Kasuga K, Kubota Y, et al. Optics Express, 2013, 21(19): 22043.
[14] Vijaya N, Upendra K K, Jayasankar C K. Spectrochimica Acta Part A Molecular & Biomolecular Spectroscopy, 2013, 113: 145.
[15] Rosemann N W, Eu?ner J P, Beyer A, et al. Science, 2016, 352: 1301.