Enhanced orange emission by doping CeB6 in CaAlSiN3:Ce3+ phosphor for application in white LEDs
来源期刊：Journal of Rare Earths2018年第12期
论文作者：Wenjie Wu Kefu Chao Wenquan Liu Lesi Wei Dahai Hu Taiyang Wang O. Tegus
文章页码：1250 - 1255
摘 要：A series of CeB6-doped and CeO2-doped Ca1-xSiAlN3:xCe3+（denoted as CASN:Ce3+@CeB6 and CASN:Ce3+@CeO2, respectively） were synthesized by alloy-nitridation method under high-purity nitrogen atmosphere. The morphologies, crystal phases, and luminescence properties were investigated in detail.With an increase in the concentration of CeB6, the unit cell volume of CASN:Ce3+@CeB6 slightly increases due to the substitution between ions, which leads to a change of micro structure around Ce3+. CASN:Ce3+@CeB6 efficiently emits yellow-orange light with a maximum emission intensity at around 550 nm for the content x of 0.01（being in comparable situation, CASN:Ce3+@CeO2 is x = 0.04） when excited at460 nm. Compared with CASN:Ce3+@CeO2, the red emission component of Ce3+ in CASN:Ce3+@CeB6 is much stronger. This is ascribed to energy transfer of intra-Ce3+（within one Ce3+ ion） and inter-Ce3+（between Ce3+ and Ce3+ ions）. In addition, the replacements of N3-（0.132 nm for CN = 4） and O2-（0.124 nm for CN = 4） by B2-（0.140 nm for CN = 4）, which can lead to a marked expansion of the host lattice and a decrease of the oxidation of samples, are also responsible for the increase of red emission component. Furthermore, CASN:Ce3+@CeB6 phosphor has an excellent thermal stability because of the partial substitution of Ce-O（Ce-N） bonds by more covalent Ce-B. As a result, the outstanding luminescent properties of CASN:Ce3+@CeB6 phosphor make it practical to use in the single phosphor-coated high-color-rendering power white LED.
Wenjie Wu1,2，Kefu Chao1,2，Wenquan Liu1,2，Lesi Wei1,2，Dahai Hu1,2，Taiyang Wang3，O. Tegus1,2
1. College of Physics and Electronic Information, Inner Mongolia Normal University2. Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials3. Leshan Vocational and Technical College
摘 要：A series of CeB6-doped and CeO2-doped Ca1-xSiAlN3:xCe3+（denoted as CASN:Ce3+@CeB6 and CASN:Ce3+@CeO2, respectively） were synthesized by alloy-nitridation method under high-purity nitrogen atmosphere. The morphologies, crystal phases, and luminescence properties were investigated in detail.With an increase in the concentration of CeB6, the unit cell volume of CASN:Ce3+@CeB6 slightly increases due to the substitution between ions, which leads to a change of micro structure around Ce3+. CASN:Ce3+@CeB6 efficiently emits yellow-orange light with a maximum emission intensity at around 550 nm for the content x of 0.01（being in comparable situation, CASN:Ce3+@CeO2 is x = 0.04） when excited at460 nm. Compared with CASN:Ce3+@CeO2, the red emission component of Ce3+ in CASN:Ce3+@CeB6 is much stronger. This is ascribed to energy transfer of intra-Ce3+（within one Ce3+ ion） and inter-Ce3+（between Ce3+ and Ce3+ ions）. In addition, the replacements of N3-（0.132 nm for CN = 4） and O2-（0.124 nm for CN = 4） by B2-（0.140 nm for CN = 4）, which can lead to a marked expansion of the host lattice and a decrease of the oxidation of samples, are also responsible for the increase of red emission component. Furthermore, CASN:Ce3+@CeB6 phosphor has an excellent thermal stability because of the partial substitution of Ce-O（Ce-N） bonds by more covalent Ce-B. As a result, the outstanding luminescent properties of CASN:Ce3+@CeB6 phosphor make it practical to use in the single phosphor-coated high-color-rendering power white LED.
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