UV/VUV switch-driven color-reversal effect for Tb-activated phosphors

Chun Che Lin; Wei-Ting Chen; Cheng-I Chu; Kuan-Wei Huang; Chiao-Wen Yeh; Bing-Ming Cheng; Ru-Shi Liu

doi:10.1038/lsa.2016.66

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UV/VUV switch-driven color-reversal effect for Tb-activated phosphors

Original Articles

- UV/VUV switch-driven color-reversal effect for Tb-activated phosphors
- Light: Science & Applications Vol. 5, Issue 2, (2016)
- Affiliations：
  
  1.Department of Chemistry, Taiwan University, Taipei
  2.Synchrotron Radiation Research, Hsinchu
  3.Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, Taipei University of Technology, Taipei
- Author bio：
  
  RS Liu, Email: rsliu@ntu.edu.tw
- Funds：
- DOI：10.1038/lsa.2016.66
  CLC：
- Published：2016-06，
  
  Published Online：07 January 2016，
  
  Received：16 August 2015，
  
  Revised：11 December 2015，
  
  Accepted：27 December 2015
- Accepted：
Scan QR Code
Lin, C. C. et al. UV/VUV switch-driven color-reversal effect for Tb-activated phosphors. Light: Science & Applications, 5, e16066 (2016).
DOI：

Lin, C. C. et al. UV/VUV switch-driven color-reversal effect for Tb-activated phosphors. Light: Science & Applications, 5, e16066 (2016). DOI： 10.1038/lsa.2016.66.

摘要

Abstract

The remarkable narrow-band emission of trivalent lanthanide-doped phosphors excited by the vacuum ultraviolet (VUV) radiation lines of Xe atoms/Xe

molecules at 147/172 nm are extensively investigated in the development of plasma display panels and Hg-free fluorescent lamps

which are frequently used in our daily lives. Numerous solid materials

particularly Tb

-doped oxides

such as silicates

phosphates and borates

are efficient green/blue sources with color-tunable properties. The excitation wavelength and rare earth concentration are usually varied to optimize efficiency and the luminescent properties. However

some underlying mechanisms for the shift in the emission colors remain unclear. The present study shows that a UV/VUV switch systematically controls the change in the phosphor (Ba

:Tb) photoluminescence from green to blue

resulting in a green emission when the system is excited with UV radiation. However

a blue color is observed when the radiation wavelength shifts to the VUV region. Thus

a configurational coordinate model is proposed for the color-reversal effect. In this model

the dominant radiative decay results in a green emission under low-energy UV excitation from the

state of the

–

inner-shell transition in the Tb system. However

under high-

energy VUV excitation

the state switches into the

state

which exhibits a blue emission. This mechanism is expected to be generally applicable to Tb-doped phosphors and useful in adjusting the optical properties against well-known cross-relaxation processes by varying the ratio of the green/blue contributions.

关键词

Keywords

color-reversalcross-relaxationphosphorterbiumUV/VUV

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