(1. 浙江師范大學(xué) 行知學(xué)院，金華 321004；
2. 浙江師范大學(xué) 化學(xué)與生命科學(xué)學(xué)院，金華 321004)
摘 要: 以Li2CO3、SrCO3、H3BO3、Sm2(CO3)3、Eu2(CO3)3、Tb2(CO3)3、(BiO)2CO3為原料，用高溫固相法合成了稀土激活離子RE3+與敏化離子Bi3+共摻雜的LiSr1-x-yBO3:yBi3+/xRE3+(RE=Sm, Eu, Tb)三個(gè)系列熒光粉。合成分兩步進(jìn)行，首先制備稀土單摻雜的熒光粉LiSr1-xBO3:xRE3+(RE=Sm, Eu, Tb)，以確定發(fā)光強(qiáng)度最大的樣品所對(duì)應(yīng)的稀土摻雜量x；其次在RE3+最佳摻雜量下，通過(guò)改變Bi3+的摻雜量來(lái)制備LiSr1-x-yBO3: yBi3+/xRE3+(RE=Sm, Eu, Tb)共摻雜熒光粉，從而研究敏化離子對(duì)激活離子的敏化情況及其中的能量轉(zhuǎn)移機(jī)理。產(chǎn)物用X射線粉末衍射(XRD)與掃描電鏡(SEM)測(cè)試其物相結(jié)構(gòu)和形貌特征，研究離子共摻雜對(duì)熒光粉發(fā)光性能的影響，同時(shí)分析了熒光粉中摻雜離子之間的能量傳遞現(xiàn)象以及能量傳遞機(jī)制。結(jié)果表明，鉍離子的摻入均能敏化基質(zhì)中稀土離子的發(fā)光，在實(shí)驗(yàn)的摻雜量范圍內(nèi)呈現(xiàn)先增強(qiáng)而后減弱的變化趨勢(shì)。根據(jù)Dexter能量轉(zhuǎn)移公式并利用發(fā)光強(qiáng)度進(jìn)行計(jì)算，可知偶極-偶極相互作用是Bi3+到RE3+能量傳遞的主要方式。
關(guān)鍵字: LiSrBO3；熒光粉；稀土；共摻雜；熒光性能
（1. Xingzhi College, Zhejiang Normal University, Jinhua 321004, China;
2. College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China）
Abstract:Three series of phosphors LiSr1-x-yBO3:yBi3+/xRE3+(RE=Sm, Eu, Tb) co-doped rare earth activating ions RE3+ and sensitizing ion Bi3+ were synthesized by high temperature solid-state reaction method from Li2CO3, SrCO3, H3BO3, Sm2(CO3)3, Eu2(CO3)3, Tb2(CO3)3, (BiO)2CO3. The synthesis was carried out in two steps. First, the single-doped rare earth RE3+phosphors LiSr1-xBO3:xRE3+(RE=Sm, Eu, Tb) were prepared so as to determine the amount of rare earth doping x corresponding to the sample with the highest luminous intensity. Secondly, under the optimal doping concentration of RE3+, LiSr1-x-yBO3:yBi3+/xRE3+(RE=Sm, Eu, Tb) co-doped phosphors were prepared by changing the doping amount of Bi3+ to study the sensitization effect of sensitized ion on activated ions and the energy transfer mechanism in it. The products were tested by X-ray powder diffractometry (XRD) and scanning electron microscopy (SEM) to test its phase structure and morphological characteristics. The effect of ion co-doping on the luminescence performance of the phosphor was studied. Meanwhile, the energy transfer phenomenon and energy transfer mechanism between co-doped ions in the phosphors were analyzed. The results show that the doping of bismuth ions can all sensitize the luminescence of rare earth ions in the matrix, and within the range of the experimental doping amount, it shows a trend of first enhancing and then weakening. According to Dexter’s energy transfer formula and calculation using luminous intensity, it can be seen that dipole-dipole interaction is the main way of energy transfer from Bi3+ to RE3+.
Key words: LiSrBO3; phosphor; rare earth; co-doped; luminescent property
