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White light generation from Dy3+-doped ZnOB2O3P2O5 glasses

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6 Author(s)
Jayasimhadri, M. ; Department of Physics, Changwon National University, Changwon 641-773, Korea ; Jang, Kiwan ; Lee, Ho Sueb ; Chen, Baojiu
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Dysprosium doped ZnOB2O3P2O5 (ZBP) glasses were prepared by a conventional melt quenching technique in order to study the luminescent properties and their utility for white light emitting diodes (LEDs). X-ray diffraction spectra revealed the amorphous nature of the glass sample. The present glasses were characterized by infrared and Raman spectra to evaluate the vibrational features of the samples. The emission and excitation spectra were reported for the ZBP glasses. Strong blue (484 nm) and yellow (574 nm) emission bands were observed upon various excitations. These two emissions correspond to the 4F9/26H15/2 and 4F9/26H13/2 transitions of Dy3+ ions, respectively. Combination of these blue and yellow bands gives white light to the naked eye. First time, it was found that ZnOB2O3P2O5 glasses efficiently emit white light under 400 and 454 nm excitations, which are nearly match with the emissions of commercial GaN blue LEDs and InGaN LED, respectively. CIE chromaticity coordinates also calculated for Dy3+: ZBP glasses to evaluate the white light emission.

Published in:

Journal of Applied Physics  (Volume:106 ,  Issue: 1 )

Date of Publication:

Jul 2009

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