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Concentration dependence of white light generation in Dy3+-doped lithium-fluoroborophosphate glasses

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Abstract

A new series of Dy3+-doped lithium-fluoroborophosphate glasses have been prepared by conventional melt-quenching technique and explored by XRD, FTIR, optical absorption, photoluminescence and decay spectral measurements . XRD results confirm the amorphous nature of the prepared glass. The physical properties were calculated with density and refractive index measurements. FTIR spectra reveal the various stretching and bending vibration of borate (BO3 and BO4) and also phosphate (PO4) networks. The absorption spectra exhibit nine absorption peaks from the ground state 6H15/2 to various excited states. Using absorption spectra ligand field environment around the Dy3+ ions, Judd–Ofelt parameters, optical band gap and Urbach’s energy were calculated and reported. The JO theory has been applied to calculate the oscillator strengths and to evaluate the radiative properties of the emission transitions of Dy3+ ions in the prepared glasses. The luminescence spectra exhibit three transitions 4F9/2 → 6HJ (J = 9/2, 11/2, 13/2) at 483 nm (blue), 574 nm (yellow) and 663 nm (red), respectively. The Inokuti–Hirayama (IH) model (S = 6) fits well with non-exponential decay curves and indicates dipole–dipole interaction between donor and acceptor Dy3+ ions through cross-relaxation. The (x, y) coordinates and CCT values of the prepared glasses are found to be near the white light region representing the suitability of synthesized glasses for solid-state lighting applications.

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Authors and Affiliations

  1. Department of Physics, Bishop Heber College (Autonomous), Affiliated To Bharathidasan University, Tiruchirappalli, 620017, India

    V. Anthony Raj

  2. Department of Physics, Kongu Engineering College, Perundurai, Erode, 638060, India

    K. Maheshvaran

  3. Department of Physics, St. Joseph’s College (Autonomous), Affiliated To Bharathidasan University, Tiruchirappalli, 620002, India

    V. Anthony Raj & I. Arul Rayappan

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  1. V. Anthony Raj
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  2. K. Maheshvaran
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  3. I. Arul Rayappan
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Correspondence to I. Arul Rayappan.

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Raj, V.A., Maheshvaran, K. & Rayappan, I.A. Concentration dependence of white light generation in Dy3+-doped lithium-fluoroborophosphate glasses. Indian J Phys 96, 2979–2991 (2022). https://doi.org/10.1007/s12648-021-02215-w

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