Luminescence Behavior of Sm³⁺ Ion Doped Potassium Aluminium Gadolinium Phosphate Glasses as Orange Laser and Photonics Applications

Abstract

Potassium aluminium gadolinium phosphate (KAGP) doped with difference contents of Sm³⁺ ion were synthesized by melt-quenching technique. The samples were further used to measure some physical, optical and luminescence properties. Absorption spectra show the hypersensitive transitions ⁶H_5/2 → ⁶P_3/2 and ⁶H_5/2 → ⁶F_7/2 at the wavelengths 402 and 1233 nm respectively. The photoluminescence spectra were recorded under 401 nm excitation, displayed the emission bands at 562, 597, 644 and 703 nm that corresponding to the transitions ⁴G_5/2 → ⁶H_J (J = 5/2, 7/2, 9/2, 11/2) respectively, and the concentration quenching of Sm³⁺ showed at 1.0 mol%. Using the highest concentration of Sm³⁺ for emission spectra, Judd–Ofelt (J–O) analysis was performed to calculate the various radiative properties such as transition probabilities (A_R), radiative lifetimes (τ_R), branching ratios (β_R) and stimulated emission cross-section (σ(λ_p)) for different excited states. From the results of J–O parameter found to be Ω₂ > Ω₆ > Ω₄ and the highest value of radiative properties was ⁴G_5/2 → ⁶H_7/2 transition. The decay curve for lower concentration was single exponential and became non-exponential for higher concentrations of the ⁴G_5/2 level. According to the chromaticity coordinates (Commission Internationale de l′Eclairage), it indicated that the KAGP glass doped Sm³⁺ ion at 1.0 mol% lies in orange region. The KAGP glass doped concentration of Sm³⁺ at 1.0 mol% has potential application in developing the orange laser and suitable for optical device also.

Keywords:

• Spectroscopic
• physical properties
• phosphate
• samarium
• glass

Acknowledgment

J. Kaewkhao would like to thank Thailand Science Research and Innovation (TSRI) for partially supporting this research.

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research project is funded by National Research Council of Thailand (NRCT) under the Royal Golden Jubilee (RGJ) Ph.D. Program (Contract No. N41A640227).