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Detailed Program
Paper Number : GL-P06 |
Time Frame : 12:00~13:30 |
Presentation Date : Thursday, 27, November |
Session Name : Glass & Opto-Electronic Materials |
Session Chair 1# : - |
Session Chair 2# : - |
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Oxyfluoride glass ceramic doped with Eu2+/Eu3+ for 400nm |
Mr. Sang Heon Lee |
Kongju National Univ. |
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Oxyfluoride glass ceramics have been widely studied due to their high chemical and thermal stability of matrix as well as low phonon energy of fluoride nano-crystals. The low phonon energy around the rare earth ions can improve quantum efficiency of the excited state, thus improve emission. In this paper, we fabricated SiO2-Na2O-Al2O3-LaF3 glasses doped with various rare earth ions. Based on absorption and PL spectra, Eu2+ and Eu3+ were selected as active ions for 400 nm LED color conversion. Concentration of carbon and EuF3 was varied to control the Eu2+/Eu3+ ratio. It was possible to obtain white color coordination under 400 nm LED excitation when 1 mol% of EuF3 with 18 wt% of carbon was added. Emission intensity was increased as the doped glass was heat treated due to nano-crystal formation. Heavy crystallization of Eu3+/Eu2+ doped glass was examined to improve absorption of the UV source and enhance color conversion efficiency when actually mounted on 400 nm LED chips. |
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