npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Physics: Sae Mulli 2003; 46: 231-236

Published online April 1, 2003

Copyright © New Physics: Sae Mulli.

Luminescence Properties of Y$_3$Al$_5$O$_{12}$ Crystal Doped with Ho$^{3+}$ and Tm$^{3+}$ Ions

Ho3+와 Tm3+ 이온이 첨가된 Y3Al5O12 결정의 형광 특성

Wansong ZHANG1 and Hyo Jin SEO1,* Young Soo CHOI2, Kiwan JANG3

1Department of Physics, Pukyong National University, Pusan 608-737
2Agency for Defense Development, Daejon 305-606
3Department of Physics, Changwon National University, Changwon 641-773



Luminescence properties of Y$_3$Al$_5$O$_{12}$ crystal doped with Tm$^{3+}$ and Ho$^{3+}$ ions have been investigated. Upconverted luminescence in the UV to green region was observed by the red laser-light excitation of Ho$^{3+}$ and Tm$^{3+}$ ions into the $^5$F$_5$ and $^3$F$_2$ states, respectively. The emission processes of upconverted and down-converted luminescences have been proposed by analyses of the emission and excitation spectra and decay times. The sequential two-photon excitation process (STEP) is only responsible for the upconverted luminescence following Ho$^{3+}$($^5$F$_5$) excitation, while the upconverted luminescence on the excitation of Tm$^{3+}$($^3$F$_2$) is attributed to STEP and energy transfer upconversion (ETU) process.

Keywords: Y$_3$Al$_5$O$_{12}$, Tm$^{3+}$, Ho$^{3+}$, Upconversion, Luminescence, Energy transfer

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