摘要
采用sol-gel法合成了系列发光体Li2O-Ln2O3-SiO2:Eu3+,Bi3+,并确定了发光体的物相结构.当Ln3+=Y3+和Ln3+=La3+时,紫外光激发下Eu3+的发射分别以红光和橙光为主,只存在一种Eu3+发光中心;Ln3+=Gd3+时,至少存在两种Eu3+发光中心和两种Bi3+发光中心(共掺杂Eu3+,Bi3+),Bi3+的吸收和发射所处的能量位置最低,4f格位的Bi3+发生了向Eu3+的有效能量传递.
The series silicate luminophors Li2O-Ln2O3-SiO2: Eu3+,Bi3+ were synthesized by sol-gel method, and their phase and structure were determined by XRD. Under the excitation of UV light, Eu3+ ions show red emission and orange emission in the case of Ln3+=Y3+ and Ln3+= La3+, respectively, in which two hosts exist only one Eu3+luminescent center. Nevertheless when Ln3+= Gd3+, at least two kinds of Eu3+and Bi3+ ions luminescent centers were observed. Bi3+has lower excitation and emission energies due to the stronger covalency for Ln3+=Gd3+, in which host an efficient energy transfer from Bi3+at 4f sites to Eu3+has been found.
出处
《无机化学学报》
CSCD
北大核心
1994年第2期205-209,共5页
Chinese Journal of Inorganic Chemistry
基金
希土化学与物理开放实验室资助
关键词
铕
铋
发光性能
能量传递
sol-gel method europium bismuth luminescenca property energy transfer