Document Type

Article

Publication Date

2007

Keywords

Y2O3:Eu, nanocrystalline, phosphor, UV-fluorescence spectroscopy, lifetime, diffusion limited energy transfer, chemical vapour reaction.

Abstract

Nanocrystalline (Y1-xEux)2O3 powder was synthesized via a chemical vapour reaction. X-ray diffraction revealed the structure of cubic yttria with crystallite sizes of about 5 nm. The Eu-dopand concentrations x for the samples in the range from 0.003 up to 0.165 were determined by EDX-spectra. The luminescence of the nanopowders was investigated by continuous and time-resolved UV-fluorescence spectroscopy and compared to a microcrystalline Y2O3:Eu phosphor as a reference. The emission spectra show an increasing intensity for higher doping concentrations. However, compared to the microcrystalline material the yield was significantly lower. The lifetime of the 5D07FJ transition in the nanocrystalline Y2O3:Eu was found to be significantly longer than for the microcrystalline reference sample. For increasing Eu-content the lifetime in the nanocrystalline samples decreased continuously from 3.71 ms to a value of 1.20 ms for the highest doping concentration. The concentration dependent lifetime behaviour was interpreted by energy transfer between Eu ions and from Eu ions to impurities as a competing process to the radiative 5D07F2 transition.

Faculty

Faculty of Applied Science & Technology

Terms of Use

Terms of Use for Works posted in SOURCE.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Original Publication Citation

Kaps, H., Arefin, M. L., Herr, U., & Paul, H. (2007). Concentration dependent fluorescence lifetime in nanocrystalline Y2O3:Eu phosphors. Solid State Phenomena, 128, 165-171. 10.4028/www.scientific.net/SSP.128.165

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