Warm white light and colour tunable characteristics of Dy3þ co-doped with Eu3þ and Pr3þ zinc sodium bismuth borate glasses for solid state lighting applications

Hegde, Vinod and Viswanath, Dwaraka C S and Mahato, KK and Kamath, Sudha D (2019) Warm white light and colour tunable characteristics of Dy3þ co-doped with Eu3þ and Pr3þ zinc sodium bismuth borate glasses for solid state lighting applications. Materials Chemistry and Physics. ISSN 0254-0584

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Abstract

Present work reports the colour tunable characteristics of Dy3þ- doped zinc sodium bismuth borate glasses with Eu3þ and Pr3þ co-dopants synthesized through melt quench technique. The absence of sharp peaks in the XRD confirmed the amorphous nature of co-doped glasses. Absorption peaks of Dy3þ, Eu3þ and Pr3þions are found in visible and NIR region of the spectrum. The optical band gap of the glasses were determined through absorption spectra. The excitation spectra exhibited various transitions of Dy3þ, Eu3þ and Pr3þ ions in the UV and blue region of the spectrum. The emission spectra of Eu3þ and Pr3þco-doped glass showed blue, yellow and red emissions. Decay curves were measured to confirm the energy transfer processes between Dy3þ→Eu3þ and Pr3þ ions. The Inokuti-Hirayama model was used to understand the nature of interaction between Dy3þ→Eu3þ and Pr3þ ions during non-radiative energy transfer in the co-doped glasses. CIE chromaticity coordinates shifted from yellowish to orange-reddish region. The correlated colour temperature value of optimum glass was around 3800 K which further illustrates the application of co-doped glasses in indoor lighting under UV/blue light excitation

Item Type: Article
Uncontrolled Keywords: Co-doping Excitation Photoemission Lifetime
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 03 Sep 2020 05:00
Last Modified: 03 Sep 2020 05:00
URI: http://eprints.manipal.edu/id/eprint/155584

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