Dy3+-doped zinc fluorophosphate glasses for white luminescence applications

作者：Vijaya N; Kumar K Upendra; Jayasankar C K^*

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2013, 113: 145-153.

DOI：10.1016/j.saa.2013.04.036

• Dy3+ ion
• Glasses
• Luminescence
• Decay rates

Dysprosium (Dy3+) ions doped zinc fluorophosphate (PKAZLEDy: P2O5-K2O-Al2O3-ZnF2-LiF-Dy2O3) glasses have been prepared and investigated their spectroscopic properties using absorption, emission and decay measurements. Judd-Ofelt analysis has been carried out to obtain the intensity parameters and in turn predicted radiative properties for the F-4(9/2) level of 1.0 mol% of Dy2O3 doped glass. Visible luminescence spectra have been obtained due to F-4(9/2) -> H-6(J) (J = 11/2, 13/2, 15/2) transitions of Dy3+ ions under 385 nm excitation. The yellow-to-blue luminescence intensity ratios and chromaticity coordinates of Dy3+ ions in these glasses have been analyzed as a function of Dy3+ ion concentration. The decay profiles for the F-4(9/2) level exhibit perfectly single exponential at lower concentrations (up to 1.0 mol%) and turn into non-exponential for higher concentrations (>1.0 mol%) due to energy transfer between donor (excited state Dy3+ ion) and acceptor (ground state Dy3+ ion). The results reveal that these glasses emit bright white light which is suitable for the development of W-LEDs.

• 出版日期2013-9