Effect of boric acid on structure,morphology and luminescent properties of divalent europium doped calcium aluminate phosphors |
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| Authors: | Chao Zeng Wen-Lin Feng Zhi Chen |
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| Institution: | 1. Department of Applied Physics, Chongqing University of Technology, Chongqing 400054, China;2. Chongqing Key Laboratory of Time Grating Sensing & Advanced Testing Technology, Chongqing 400054, China;3. School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China;4. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | Blue phosphors Ca1 − xAl2O4: xEu2+ were prepared by high temperature solid-state method. Their structure, morphology and luminescent properties were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and fluorescence spectroscopy. The effect of different amounts of fluxing agent H3BO3 on structure, morphology and luminescent properties of blue phosphors Ca1 − xAl2O4: xEu2+ luminous intensity caused by different amount of H3BO3 was also investigated. The amount of H3BO3 doped Ca1 − xAl2O4: xEu2+ in optimal luminous intensity had been determined. The results showed that both the excitation and emission spectra of samples were all broad bands, and that the peak of emission spectra was near 442 nm, which was corresponding to the 4f65d → 4f7 transition of Eu2+ illuminating blue light. Ca1 − xAl2O4: xEu2+ (x = 3.5 mol%) could be gained with good morphology and the best luminous intensity when H3BO3 mass ratio was 0.5 wt%. |
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| Keywords: | High temperature solid-state method Photoluminescence H3BO3 Blue phosphors CaAl2O4: Eu2+ |
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