摘要
本文采用高温固相法合成了Ca9Al(Po4)7:Eu3+红色荧光粉,并对其发光特性进行了研究。该荧光粉在350nm-410nm有一个宽带激发峰,适用于UVLED管芯的激发;在紫外激发下的发射峰由位于589nm和593nm,612nm、616nm和619nm,654nm及688nm四组线状峰构成,分别对应于Eu3+的(5D0～7F1)、(5D0～7F2)、(5D0～7F3)及(5D0～7F4)特征跃迁,呈现红色发光。探讨了掺杂的Eu3+浓度对样品发光强度的影响,其最佳掺杂浓度为5%。研究了其自身浓度猝灭机理,为电偶极-电四极相互作用。发现不同电荷补偿剂Li+,Na+,K+的引入均能使发光强度得到提高,尤其以Li+最佳,发光强度提高了大约35%。结果表明,Ca9Al(Po4)7:Eu3+是一种适用于UVLED管芯激发的用于白光LED的红色荧光粉。
The Ca9Al（Po4）7：Eu^3＋phosphor was synthesized by high temperature solid state reaction.It shows four group major emission peaks locating at 589nm and 593nm,612nm,616nm and 619nm,654nm and 688nm respectively that correspond to the 5D0～7F1,5D0～7F2,5D0～7F3 and 5D0～7F4 typical transition of Eu^3＋.The influence of the concentration of Eu^3＋ ions to the emission intensity was investigated and the concentration quench was happened when the concentration of Eu^3＋ ions was 5%.The role of charge compensation of Li^＋,Na^＋ and K^＋ions to the emission intensity was studied also.It was found that Li^＋ ions gave the best improvement to enhance the intensity of the emissions.The results show that Ca9Al（Po4）7：Eu^3＋,Li^＋ red-emitting phosphor is very suitable for white light emitting diode（w-LED） based on UV InGaN chip.
出处
《功能材料与器件学报》
CAS
CSCD
北大核心
2010年第5期511-514,共4页
Journal of Functional Materials and Devices
基金
适于紫外-近紫外LED激发的单一基质荧光粉研究(F2009000217)
