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Vol.39, No.2, 228 ~ 232, 2001
Title
A Study on the Luminescent Properities of ZnGa2O4 Co - Activated with Trivalent Rare - Earth and Lithium
김용태Yong Tae Kim,유호진Ho Jin Ryu,박희동Hee Dong Park,최대규Dae Kue Choi,이명진Myung Jin Lee,정경원Kyung Won Jeong,전애경Ae Kyoung Jun,윤기현Ki Hyun Yoon
Abstract
The photoluminescence characteristics of lithium and trivalent rare-earth ions(Ce^(3+), Dy^(3+), Tm^(3+)) doped ZnGa₂O₄ with solid state reaction methods were studied. Under 254 ㎚ excitation, the absorption band at 245 ㎚ and the emission band at 380 ㎚ in reduced ZnGa₂O₄ phosphor were observed, which were originated from ⁴T₂→⁴A₂ transition of the octahedral Ga^(3+) ions in the spinel lattice. The incorporation of lithium and trivalent rare-earth ions into the ZnGa₂O₄ lattices results in the emission peak shift of nearly 50 ㎚ towards long wavelength region and improving the emission intensity and color purity.
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