CAJ | 학술논문

采用Al（NO3）3、Y（NO3）3和Ce（NO3）3为母盐,碳酸氢铵为沉淀剂,利用撞击流共沉淀法制备YAG：Ce（Y3Al5O12：Ce）球形纳米粉体。利用XRD、FT-IR、SEM和荧光分光光度计对YAG前驱体及煅烧纳米粉体进行了表征,并分析了母盐溶液的浓度、溶液的滴加速度以及煅烧方法和温度对制备YAG纳米粉体的影响。结果表明母盐溶液的浓度、滴加速度及煅烧方法和温度对煅烧粉体的组成、分散性、形貌及发光性能有显著的影响。当初始原料浓度较低（c0=0.055mol/L）时,900℃可以获得纯YAG晶相,不形成任何中间相;初始浓度c0在1.0mol/L以上时,1000℃得到的YAG荧光粉中有YAM、YAP和CeO2杂质相存在;适当的提高加料速度,可以增加粉体的结晶度;采用Na2CO3-S-K2CO3助熔剂辅助煅烧,700℃时已完全转变为YAG相,与直接煅烧法相比,YAG相的完全转变温度降低了约300℃,荧光粉的发光强度比不加熔盐明显提高了。
채용Al（NO3）3、Y（NO3）3화Ce（NO3）3위모염,탄산경안위침정제,이용당격류공침정법제비YAG：Ce（Y3Al5O12：Ce）구형납미분체。이용XRD、FT-IR、SEM화형광분광광도계대YAG전구체급단소납미분체진행료표정,병분석료모염용액적농도、용액적적가속도이급단소방법화온도대제비YAG납미분체적영향。결과표명모염용액적농도、적가속도급단소방법화온도대단소분체적조성、분산성、형모급발광성능유현저적영향。당초시원료농도교저（c0=0.055mol/L）시,900℃가이획득순YAG정상,불형성임하중간상;초시농도c0재1.0mol/L이상시,1000℃득도적YAG형광분중유YAM、YAP화CeO2잡질상존재;괄당적제고가료속도,가이증가분체적결정도;채용Na2CO3-S-K2CO3조용제보조단소,700℃시이완전전변위YAG상,여직접단소법상비,YAG상적완전전변온도강저료약300℃,형광분적발광강도비불가용염명현제고료。
Ce doped yttrium aluminum garnet（YAG∶Ce） spherical nanopowder was synthesized by dropping Al（NO3）3·9H2O,Y（NO3）3·6H2O and Ce（NO3）3·6H2O solution and ammonium hydrogen carbonate solution into the impinging streams reactor simultaneously at the same rate.The precursors and the YAG∶Ce powders were characterized by XRD,FT-IR,SEM and fluorescence spectrophotometer.The factors affecting the powder characteristics,including the mother salt concentration,the dropping speeds of solutions solution,and sintering methods and temperature were analyzed and discussed.The results show that the dispersion,the composition,the morphology and luminescence intensity of the YAG phosphors are affected remarkably by these factors.The YAG powders without any interphases can be obtained at 900℃ when the mother salt concentration（c0=0.055mol/L） is relatively low;the YAG phosphors including YAM,YAP and CeO2 impurity phases were prepared at 1000℃ when the mother salt concentration（c01.0mol/L） is high.The crystallinity can be increased with the increasing feeding rate at corresponding scope.The pure YAG phase could be obtained by Na2CO3-S-K2CO3 mixture flux calcination method at 700℃.Compared with the direct calcination method,the YAG∶Ce3＋ phase transition temperature with the present method can be decreased about 300℃,and the luminescent intensity of as-prepared phosphor can be increased greatly than that prepared by direct baking method.