Enhanced Red Emission in CaMoO4:Bi3+,Eu3+
Enhanced Red Emission in CaMoO4:Bi3+,Eu3+
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DOI：
10.1021/jp073991c
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
Suxia Yan;Jiahua Zhang;Xia Zhang;Shaozhe Lu;X. Ren;Z. Nie;Xiaojun Wang
中科院分区：
文献类型：
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作者：
Suxia Yan;Jiahua Zhang;Xia Zhang;Shaozhe Lu;X. Ren;Z. Nie;Xiaojun Wang
本文报道了掺Eu~(3+)的掺Bi3+的CaMoO_4在395 nm和465 nm激发下，由5D0→_7F_2跃迁引起的613 nm红光发射增强。研究了Bi3+和Eu3+浓度对发光性质的影响。通过添加Bi3+而不是增加Eu3+的浓度，获得了强烈增强的Eu3+红光发射。对于固定的Eu3+浓度，存在一个最佳的Bi3+浓度，此时发光强度最大。当共掺0.2Bi3+时，CaMoO4：0.05Eu3+的红光发射增强了3倍，比商品Y2O2S：Eu3+和Y2O3：Eu3+的红光发射都要强。寿命和漫反射光谱测量表明，红光发射的增强是由于Eu3+在扭曲晶场中从基态跃迁到5L6和5D2态的几率增加所致，认为奇数阶晶场越大，红光发射越强。
We report the observation of enhanced red emission at 613 nm originating from 5D0 → 7F2 transition of Eu3+-doped CaMoO4 with Bi3+ as an additive, under excitation either into the 5L6 state with 395 nm or the 5D2 state with 465 nm. The luminescence properties as a function of Bi3+ and Eu3+ concentrations are studied. Strongly enhanced red emission of Eu3+ is obtained by adding Bi3+ instead of increasing the Eu3+ concentration. For a fixed Eu3+ concentration, there is an optimal Bi3+ concentration, at which the maximum luminescence intensity is achieved. The red emission of CaMoO4:0.05Eu3+ is enhanced by a factor of 3 as 0.2 Bi3+ is co-doped into the system, stronger than that of commercial Y2O2S:Eu3+ and Y2O3:Eu3+ phosphors. Lifetime and diffuse reflection spectra measurements indicate that the red emission enhancement is due to the enhanced transition probabilities from the ground state to 5L6 and 5D2 states of Eu3+ in the distorted crystal field in which it is considered that more odd-rank crystal field ...