Enhanced Optical Properties of Bredigite‐Structure Ca13.7Eu0.3Mg2[SiO4]8 Phosphor: Effective Eu Reduction by La Co‐Doping |
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| Authors: | Seung Jun Kim Ho Seong Jang Sanjith Unithrattil Yoon Hwa Kim Won Bin Im |
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| Affiliation: | 1. School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, Korea;2. Materials Architecturing Research Center, Korea Institute of Science and Technology, Seoul, Korea |
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| Abstract: | A green phosphor, La0.4Ca13.3Eu0.3Mg2Si8O31.6+δN0.4?δ (LaCMSN:Eu2+), was prepared by a solid‐state reaction and an efficient green emission was observed at 506 nm under near‐ultraviolet (NUV) excitation. The structural and optical properties of LaCMSN:Eu2+ phosphors as well as their thermal quenching were investigated. The partial substitution of La3+ and N3? in Ca13.7Eu0.3Mg2Si8O32 led to a considerable enhancement in the peak emission intensity by as much as 194%. This demonstrates not only that the total number of Eu2+ activators increased, but also that the probability of a nonradiative transition between Eu2+ and Eu3+ could be reduced as the increase in concentration of the former is at the expense of the later. The white light‐emitting diode (LED) was fabricated using phosphor with a NUV LED chip. The LED showed warm white light with an excellent color rendering index of 91. The LaCMSN:Eu2+ is thus a potential green‐emitting phosphor for white LEDs. |
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