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Potassium aluminium gadolinium phosphate (KAGP) doped with difference contents of Sm 3+  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  6 H 5/2  →  6 P 3/2  and  6 H 5/2  →  6 F 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  4 G 5/2  →  6 H J  ( J  = 5/2, 7/2, 9/2, 11/2) respectively, and the concentration quenching of Sm 3+  showed at 1.0 mol%. Using the highest concentration of Sm 3+  for emission spectra, Judd–Ofelt (J–O) analysis was performed to calculate the various radiative properties such as transition probabilities (A R ), radiative lifetimes ( τR ), branching ratios ( βR ) and stimulated emission cross-section ( σ ( λp )) for different excited states. From the results of J–O parameter found to be Ω 2  &gt; Ω 6  &gt; Ω 4  and the highest value of radiative properties was  4 G 5/2  →  6 H 7/2  transition. The decay curve for lower concentration was single exponential and became non-exponential for higher concentrations of the  4 G 5/2  level. According to the chromaticity coordinates (Commission Internationale de l′Eclairage), it indicated that the KAGP glass doped Sm 3+  ion at 1.0 mol% lies in orange region. The KAGP glass doped concentration of Sm 3+  at 1.0 mol% has potential application in developing the orange laser and suitable for optical device also.

Luminescence Behavior of Sm 3+ Ion Doped Potassium Aluminium Gadolinium Phosphate Glasses as Orange Laser and Photonics Applications