Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5395897 | Journal of Electron Spectroscopy and Related Phenomena | 2014 | 8 Pages |
Abstract
The structure and luminescent properties of Tb3+-Eu3+ co-activated Ca0.3Sr0.7Al2O4 powder phosphor prepared via solution combustion (SC) method were investigated. The phosphor was analyzed using UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron (XPS), time of flight secondary ion mass spectroscopy (ToF-SIMS), photoluminescence spectroscopy, synchrotron radiation spectroscopy and cathodoluminescence spectroscopy. In particular, the unintended reduction of Eu3+ to Eu2+ was illustrated from the ToF-SIMS, XPS and luminescent spectroscopy data. This reduction is known to occur under certain conditions and possible mechanisms for the reduction are discussed. The chemical imaging performed with ToF-SIMS illustrated how individual ions were distributed in the crystal. Tunable luminescence was observed when the phosphor was optically-excited by different excitation sources including a 325Â nm He-Cd laser, synchrotron radiation and high energy electrons. This phosphor was evaluated for application in different types of light emitting devices.
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Physical and Theoretical Chemistry
Authors
Samy K.K. Shaat, Hendrik C. Swart, Odireleng M. Ntwaeaborwa,