26 July 2011 White light generation in Dy3+-doped fluorosilicate glasses for W-LED applications
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Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 80012N (2011) https://doi.org/10.1117/12.892139
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal
Abstract
Dysprosium doped fluorosilicate (SNbKZLF:SiO2-Nb2O5-K2O-ZnF2-LiF) glasses have been prepared and studied through excitation, emission and decay rate analysis. Sharp emission peaks were observed at 485 nm (blue) and 577 nm (yellow) under 387 nm excitation, which are attributed to 4F9/26H15/2 and 4F9/26H13/2 transitions, respectively, of Dy3+ ions. The yellow-to-blue intensity ratio increases (0.85 to 1.19) with increase in Dy3+ ion concentration. The decay rates exhibit single exponential for lower concentrations and turns into non-exponential for higher concentrations. The non-exponential nature of the decay rates are well-fitted to the Inokuti-Hirayama model for S = 6, which indicates that the nature of the energy transfer between donor and acceptor ions is of dipole-dipole type. The lifetime for the 4F9/2 level of Dy3+ ion decreases (0.42 to 0.14 ms), whereas energy transfer parameter increases (0.11 to 0.99) with increase of Dy3+ ion concentration (0.05 to 4.0 mol %). The chromaticity coordinates have been calculated from the emission spectra and analyzed with Commission International de I'Eclairage diagram. The chromaticity coordinates appeared in the white light region for all concentrations of Dy3+ ions in the present glasses. The correlated color temperature value decreases from 5597 K (closer to the day light value of 5500 K) to 4524 K with increase of Dy2O3 ion concentration from 0.01 to 4.0 mol %. These results indicate that Dy3+:SNbKZLF glasses can be considered as a potential host material for the development of white light emitting diodes.
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K. Venkata Krishnaiah, K. Venkata Krishnaiah, C. K. Jayasankar, C. K. Jayasankar, } "White light generation in Dy3+-doped fluorosilicate glasses for W-LED applications", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80012N (26 July 2011); doi: 10.1117/12.892139; https://doi.org/10.1117/12.892139
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