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本研究采用较温和的高温固相法,用碱土金属离子Sr2+和Ba2+取代Y3+离子进行基质取代,合成了一系列(Y0.98-xSrx)3Al5O12:Ce0.06和(Y0.98-xBax)3Al5O12:Ce0.06荧光粉。运用XRD对荧光粉进行了表征,试验结果表明:在一定的掺杂取代范围内,这些体系具有立方石榴石结构。运用荧光光谱仪对荧光粉的发光性能进行了表征,试验结果表明:当用Sr2+或Ba2+取代Y3+离子时,随着Sr2+、Ba2+取代量的增大,发射峰峰值不变,发光强度都是先增大后减小,分别在x=0.10和0.05时达到最大值。这可能是电荷补偿效应的作用,即用2价的Sr2+或Ba2+取代3价的Y3+产生的负电荷补偿Ce4+转化成Ce3+所需要的负电荷。
In this study, a series of (Y0.98-xSrx) 3Al5O12: Ce0.06 and (Y0.98-xBax) 3Al5O12 (Y0.98-xBax) nanocrystals were synthesized by relatively mild high temperature solid phase method using alkaline earth metal ions Sr2 + and Ba2 + instead of Y3 + : Ce0.06 phosphor. XRD was used to characterize the phosphors. The experimental results show that these systems have the cubic garnet structure within a certain doping substitution range. The results showed that when Sr2 + or Ba2 + was substituted for Y3 + ions, the emission peaks and peak values were unchanged with the increase of Sr2 + and Ba2 + substitutions, and the emission intensities were increased first After the big reduction, respectively, at x = 0.10 and 0.05 to reach the maximum. This may be the effect of the charge compensation effect, that is, the negative charge generated by replacing the trivalent Y3 + with divalent Sr2 + or Ba2 + compensates for the negative charge required for conversion of Ce4 + into Ce3 +.