Dy3þ: B2O3–Al2O3–ZnF2–NaF/LiF oxyfluoride glasses for cool white or day white light-emitting applications

Lakshminarayana, G and Vighnesh, K R and Prabhu, Nimitha S and Lee, Dong-Eun and Yoon, Joghun and Park, Taejoon and Kamath, Sudha D (2021) Dy3þ: B2O3–Al2O3–ZnF2–NaF/LiF oxyfluoride glasses for cool white or day white light-emitting applications. Optical Materials, 108. ISSN 0925-3467

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Abstract

Structural, thermal and optical characteristics of 0.5 mol% Dy3þ-doped oxyfluoride zinc alumino borate glasses were studied by XRD, FTIR, DSC, optical absorption, and luminescence approaches. All FTIR spectra indicate the presence of functional groups like BO4 and BO3 units, and AlO6 groups. Dy3þ shows emission bands at 483 nm ( 4 F9/2 → 6 H15/2 transition, blue), 575 nm ( 4 F9/2 → 6 H13/2 transition, yellow), and 663 nm ( 4 F9/2 → 6 H11/2 transition, weak red), respectively, under 350 nm excitation. Among all samples, 54.5B2O3–5Al2O3–10ZnF2–30NaF–0.5Dy2O3 glass exhibits the highest intensity for all observed emission bands. The emission spectral data were used to compute yellow/blue (Y=B) ratios, color chromaticity coordinates (x, y), correlated color temperatures (CCT), Duv, and color purity (CP) of the samples. The deduced color coordinates (0.345, 0.350), 5003 K CCT at

Item Type: Article
Uncontrolled Keywords: Dy3þ: B2O3–Al2O3–ZnF2–NaF–LiF glass Mixed alkali effect Luminescence Correlated color temperature Color purity WLEDs
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 23 Apr 2021 10:23
Last Modified: 23 Apr 2021 10:23
URI: http://eprints.manipal.edu/id/eprint/156706

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