| Title |
Optical Properties of CdAl_2S_4 : Co_{2+} Single Crystal |
| Authors |
김형곤(Kim, Hyung-Gon) ; 김남오(Kim, Nam-Oh) ; 손경춘(Son, Kyeong-Choon) |
| Keywords |
광흡수 ; 광 에너지 갭 ; 결정장 매개변수 Optical absorption ; Optical energy gap ; Crystal field parameter |
| Abstract |
The CdAl_2S_4 and CdAl_2S_4 : Co^{2+} single crystals were grown by the chemical transport reaction method using iodine as a transport agent. The CdAl_2S_4 and CdAl_2S_4 : Co^{2+}single crystals were crystallized into a defect chalcopyrite structure. The optical energy gap of the CdAl_2S_4 and CdAl_2S_4 : Co^{2+} single crystals was found to be 3.377 eV and 2.924 eV, respectively, at 300 K. Blue emission with peaks in 456nm~466nm at 280K was observed in the CdAl_2S_4 single crystal. Optical absorption and emission peaks due to impurities in the CdAl_2S_4 Co^{2+} single crystal were observed and described as originating from the electron transition between energy levels of the Co^{2+} ion sited at the Td symmetry point. |