17 September 2002 Blue-emitting long-afterglow photoluminescence phosphor
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By changing the ratio of Al:Sr, we get a new type phosphor SeAl3O5(OH):Eu2+,Dy3+ emitting blue light with the afterglow characteristics of over 10 hours. The emitting peak is at 484nm, which is corresponding to the spectral transition 4f5d of Eu2+. The influence of different temperatures and different fluex on the luminescent properties of SrAl3O5(OH):Eu2+,Dy3+ was studied. The results indicate that increasing the sintering temperature helps crystal to grow, and that the luminescent properties of SrAl3O5(OH):Eu2+,Dy3+ is improved by higher temperature or the flux especially H3BO3, which increases the initial brightness and prolongs the afterglow time comparing with the SrAl3O5(OH):Eu2+,Dy3+ that without additives.
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Zhiping Yang, Shengchao Zhu, Zhi Guo, Wenjie Wang, Zheng Liu, "Blue-emitting long-afterglow photoluminescence phosphor", Proc. SPIE 4918, Materials, Devices, and Systems for Display and Lighting, (17 September 2002); doi: 10.1117/12.483107; https://doi.org/10.1117/12.483107

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