Improving white light emission and quantum yield of Ce@Eu co-doped silicate glass by reducing Eu3+ to Eu2+ with Si3N4 |
| |
Authors: | Xiao Ma Zhifeng Huang Hailong Yuan Yujuan Zhou Meijuan Li Fei Chen Qiang Shen |
| |
Affiliation: | 1. Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou, Guangdong, P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China;3. Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou, Guangdong, P. R. China |
| |
Abstract: | Rare-earth-doped transparent glass shows great potential in white light-emitting diodes (wLEDs) application due to its excellent optical and luminous properties. Currently reported commercial wLEDs have a drawback in red emission missing, which leads to a relatively low color rendering index (CRI) and a relatively high correlated color temperature (CCT). In this work, Ce@Eu Sr–Si–O glass is fabricated using a high-temperature quenching method. The white light is available when the ratio of Ce3+/Eu3+ equals 1, and the emitting color can be adjusted from blue to red by controlling the ratio of Ce3+/Eu3+. To further optimize the white light, Eu3+ ions can be reduced to Eu2+ according to the reaction of 6Eu3+ + 2N3− → 6Eu2+ + N2↑ by introducing Si3N4. As a result, the standard white light emission can be achieved in the Ce@Eu silicate glass contributed by the blue light from Ce3+, red light from Eu3+, and yellow–green light from Eu2+ (two elements, three emission). This glass shows excellent luminous properties, such as a color coordinate is (0.3651, 0.3269) in CIE 1931 color coordinate diagram, a CRI is over 70, a high quantum yield of 36.02%, and a CCT of 4117 K. |
| |
Keywords: | Ce@Eu luminescent properties Si3N4 silicate glass wLEDs |
|
|