采用共沉淀法制备了YGB:Eu~(3+)红色荧光粉.XRD研究表明,Gd~(3+)的掺入使其晶胞参数增加,并引起一定程度的晶格畸变.YGB:Eu~(3+)中Eu~(3+)的VUV激发发射主要借助于基质吸收,而CTS亦起一定作用.YGB:Eu~(3+)的基质吸收带与CTS均有一定的红移,强度有一定变化.在UV区存在Gd~(3+)→,Eu~(3+)的能量传递.由于Eu~(3+)5s5p轨道对晶场的屏蔽作用,Gd~(3+)浓度基本不影响发射峰的位置.Gd~(3+)浓度的增加,色纯度有一定的改善.Gd~(3+)的掺入影响了晶体对称性并使晶体中A格位数目增加是主要原因.适度的晶格畸变有利于基质对能量的吸收,使Eu~(3+)辐射效率达到最大,适宜的Gd~(3+)的浓度约为0.3mol.
(Y,Gd)BO_3:Eu~(3+)(YGB:Eu~(3+))red phosphor was synthesized by the coprecipita-tion method.The XRD result shows that crystal parameters of YGB:Eu~(3+) increase and the crysml lattice distortion occurs to some extent while the concentration of Gd~(3+) increasing.The luminescent efficiency of YGB:Eu~(3+) under VUV is relative to the matrix absorption and CTS of Eu~(3+)-O~(2-),nd the former is the major factor.The red-shift of absorption bands of the matrix and CTS exists with addition of Gd~(3+) in YGB:Eu~(3+).Gd~(3+)→Eu~(3+) energy transition exists under UV radiation.The concentration of Gd~(3+) is of no importance to the position of emission peaks of YGB:Eu~(3+) due to the shield of Eu~(3+) 5s5p orbits.The color purity of YGB:Eu~(3+) improves with the increase of concentration of Gd~(3+),because of the increase of the number of Eu~(3+) which occupy the symmetry centers in the crystal cell resulting from the change of crystal field.Suitable crystal distortion is helpful to the luminescent efficiency of YGB:Eu~(3+) under VUV,and the optimum concentration of Gd~(3+) is 0.3 mol.
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