CAJ | 학술논문

采用sol-gel法制备了稀土Tb3+掺杂的SiO2发光于凝胶,对样品微观结构和发光性能进行了表征,研究了含水量对样品荧光强弱,磷光特性,发光衰减等的影响.结果表明:当溶液中正硅酸乙酯、无水乙醇、蒸馏水配比为1∶4∶4时,650℃退火样品的发光最强,当配比为1∶4∶5时,750℃退火样品的发光最强,当配比为1∶4∶6时,850℃退火样品的发光最强.随着含水量的增加,经750℃退火处理的样品,发光强度先减弱后增强之后又减弱.可见,含水量和退火温度同时影响着Tb3+的发光,对发光强度的影响形成了一个竞争机制.通过测试磷光,初步得知基质中含有缺陷空位,含水量对磷光强度影响趋势与荧光的趋势一致.此外,含水量对发光衰减时间也有明显的影响.
채용sol-gel법제비료희토Tb3+참잡적SiO2발광우응효,대양품미관결구화발광성능진행료표정,연구료함수량대양품형광강약,린광특성,발광쇠감등적영향.결과표명:당용액중정규산을지、무수을순、증류수배비위1∶4∶4시,650℃퇴화양품적발광최강,당배비위1∶4∶5시,750℃퇴화양품적발광최강,당배비위1∶4∶6시,850℃퇴화양품적발광최강.수착함수량적증가,경750℃퇴화처리적양품,발광강도선감약후증강지후우감약.가견,함수량화퇴화온도동시영향착Tb3+적발광,대발광강도적영향형성료일개경쟁궤제.통과측시린광,초보득지기질중함유결함공위,함수량대린광강도영향추세여형광적추세일치.차외,함수량대발광쇠감시간야유명현적영향.
Tb-doped luminescent SiC2 xerngel was prepared by the sol-gel technique.FTIR was used to measure the microstructure of the luminescent materials.The luminescence properties were characterized by F-7000 UV-visible fluorescence spectrophotometer.The effects of the molar ratio of H2O on the fluorescence and phosphorescence intensity and phosphorescence lifetime of the sample were mainly investigated.The results showed that for the Tb3+ doped xerogels,the.sample of 1∶4∶4 annealed at 650 ℃ reaches the maximum intensity,the sample of 1∶4∶5 annealed at 750 ℃ reaches the maximum,the sample of 1∶4∶6 annealed at 850 ℃ is the strongest.With increasing the amount of water,the luminous intensity of the samples annealed at 750 ℃ was first weakened,then enhanced and finally weakened.It was shown that the luminous intensity of samples is related to the molar ratio of aqueous solutions and annealing temperature,whose influence on the luminous intensity formed a competitive mechanism.Phosphorescence was observed at the same time,illustrating the existence of defects in the matrix space,and that the influence of water on the intensity is the same as that of fluorescence.In addition,with the increase in the molar ratio of aqueous solutions,the amount of defect gradually changed and resulted in a change in the luminescence decay time.