Dy3+: B2O3–Al2O3–ZnF2–NaF/LiF oxyfluoride glasses for cool white or day white light-emitting applications

G. Lakshminarayana, K. R. Vighnesh, Nimitha S. Prabhu, Dong Eun Lee, Jonghun Yoon, Taejoon Park, Sudha D. Kamath

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14 Citations (Scopus)


Structural, thermal and optical characteristics of 0.5 mol% Dy3+-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. Dy3+ shows emission bands at 483 nm (4F9/26H15/2 transition, blue), 575 nm (4F9/26H13/2 transition, yellow), and 663 nm (4F9/26H11/2 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 −0.001 Duv with 9% color purity for 54.5B2O3–5Al2O3–10ZnF2–30NaF–0.5Dy2O3 sample hints it as a potential candidate for WLEDs application.

Original languageEnglish
Article number110186
JournalOptical Materials
Publication statusPublished - 10-2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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