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采用高温固相反应法合成系列Lu_(2.92)Ce_(0.08)Al_(5-y)SiyO_(12-y)N_y(LuAG-CSN)荧光粉,研究了利用CeSi_3N_5实现Si-N在Lu_3Al_5O_(12):Ce(LuAG)荧光粉中的均匀有序掺杂,以优化和调控荧光粉的光致发光特性。首先合成了高纯度的CeSi_3N_5原料,然后采用CeO_2和CeSi_3N_5的组合实现优化Ce浓度(Lu∶Ce=2.92∶0.08)下的Si-N可控均匀掺杂。从荧光粉的激发发射光谱,发现适量的Si-N共掺可以明显增强荧光粉的荧光性能,而且使发射光谱宽化,450 nm蓝光激发的发射峰可从524.2 nm连续调节到556.4 nm,从而能有效优化白光LED的发光效率和调节色坐标,同时发现,所获LuAG荧光粉具有一定的余辉性能。而利用Si3N4作起始原料的掺杂虽然也可以使发射波长宽化,但会显著减低发射强度,且几乎没有余辉特性。
A series of Lu_ (2.92) Ce_ (0.08) Al_ (5-y) SiyO_ (12-y) N_y (LuAG-CSN) phosphors were synthesized by the high temperature solid-state reaction method. The effect of Si-N on the photocatalytic activity of Lu_3Al_5O_ (12) : Ce (LuAG) phosphor in uniform orderly doping, in order to optimize and regulate the photoluminescence properties of phosphors. Firstly, a high purity CeSi3N5 raw material was synthesized, and then the combination of CeO2 and CeSi3N5 was used to control the uniform Si-N doping under optimized Ce concentration (Lu: Ce = 2.92:0.08). From the excitation emission spectra of the phosphors, it was found that the appropriate amount of Si-N co-doping can significantly enhance the fluorescence of the phosphors, and the emission spectra are widened. The emission peak excited by 450 nm blue light can be continuously adjusted from 524.2 nm to 556.4 nm Can effectively optimize the luminous efficiency and adjust the color coordinates of the white LED, at the same time, it is found that the obtained LuAG phosphor has a certain afterglow performance. The use of Si3N4 as a starting material for doping, although the emission wavelength can be widened, but will significantly reduce the emission intensity, and almost no afterglow properties.