Optical Property and Thermal Stability of Eu3+ Ion Doped Borate Glass

doi:10.15541/jim20160616

Abstract

Abstract:

Fluorescent glass has advantages of homogeneous light emission, excellent thermal stability, and stable product quality as compared with traditional phosphors. Therefore, fluorescent glass in the field of LED has become a research hot spot in recent years. In this paper, Eu³⁺doped borate glasses were synthesized via the conventional melt-quenching technique. The luminescence properties and thermal stability of the fluorescent glass samples were characterized by fluorescence spectra. The doping concentration of RE³⁺ ions is an important factor influencing the samples’ luminescent performance. Based on the Van Uitert model, concentration quenching behavior for the prepared glass samples was studied. It is found that the fluorescence quenching of the samples is attributed to the nonradiative energy transfer through cross-relaxation mechanism between energy levels of Eu³⁺. As is known to all, the temperature dependence of fluorescence glass’ luminescence is also important to the practical applications. The temperature quenching mechanism for the prepared glass samples was analyzed by Arrhenius model, and it was found that the temperature quenching could be ascribed to the crossover model. The activation energy for the prepared glass samples is obtained from fitting processes which is found to be (0.35±0.04) eV. The interaction between Eu³⁺ ion and glass host was also analyzed. The result shows that the interaction between Eu³⁺ ions and the glass host is weak coupling.

Key words: luminescent properties, concentration quenching, temperature quenching

CLC Number:

TQ174

YAN Shao-Feng, WU Zhong-Li, WU Hong-Mei, LIAO Guo-Jin, LI Yu, LIU Tong, ZHAO Xin-Bin. Optical Property and Thermal Stability of Eu³⁺ Ion Doped Borate Glass[J]. Journal of Inorganic Materials, 2017, 32(7): 765-769.

Figures/Tables 5

Fig. 1 Excitation spectra of BML+xEu2O3 (x=0.1, 1.0, 5.0, 8.0 and 10.0) glasses monitored at λem=615 nm

Fig. 2 Emission spectra of BML+xEu2O3(x=0.1, 1.0, 5.0, 8.0 and 10.0) glasses excited at λex=394 nm

Fig. 3 Relationship between integrated intensity of 5D0→7FJ (J=0, 1, 2, 3, 4) transition and Eu2O3 concentration (λex= 394 nm)The solid curve shows the fitting curve

Fig. 4 (a) Emission spectra of BML+10Eu2O3 sample upon 394 nm excitation measured at various temperatures, and (b) dependence of integrate emission intensity on the testing temperatureDispersed dots present the experimental data, solid curve is fitting curve. The inset is temperature quenching mechanism

Fig. 5 Phonon side band spectrum of the Eu3+ doped BML glass monitoring the 5D0→7F2 emission at 615 nm. Insert shows the measuring principle of phonon side band

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Optical Property and Thermal Stability of Eu³⁺ Ion Doped Borate Glass

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