Luminescence properties of a new Tb3+ ion activated long persistent phosphor (새로운 Tb3+ 이온 활성 축광성 형광체의 발광 특성)

박병석; Jong Geon Choi (최종건)

Luminescence properties of a new Tb3+ ion activated long persistent phosphor

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2009, 19(3), pp.130~134
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

박병석 ¹, Jong Geon Choi ¹

¹동신대학교

Accredited

ABSTRACT

A new long persistent phosphors of CaZrO3 was synthesized at high temperature with weak reduction atmosphere by a traditional solid state reaction method. Photoluminescence spectra analysis showed that the CaZrO3 doped with Tb3+ emitted green-yellow emission caused by the energy level transition from the 5D3 and 5D4 to 7F1~7F6. The main emission spectra of 542 nm peak by the 5D4→7F5 transition was revealed through synthesizing at high temperature in N2 gas atmosphere. The afterglow emission spectra of CaZrO3 : Tb3+ long persistent phosphores arise at 546 nm peak of narrow range. After the 254 nm ultraviolet light excitation source was switched off, the green-yellow long persistent phosphor can be observed which could last for 8 h in the limit of light perception of dark-adapted human eyes (0.32 mcd/m2).

KEYWORDS

Luminescence, CaZrO3, Tb 3+, Electron trap center, Afterglow

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