Photoluminescence analysis of Er nanoparticles in cadmium-phosphate glasses

In this work, Judd–Ofelt analysis is applied to Er nanoparticles doped cadmium-phosphate glasses in order to evaluate their potential in glass laser systems. The phenomenological Judd–Ofelt parameters Ω(2), Ω(4) and Ω(6) are determined for one glass system and the quality factor is compared with equivalent parameters for several other glass hosts. The spontaneous emission probabilities, lifetimes, branching ratios of Er3 + transitions from the excited – state J manifolds to the lower – lying Jʹ manifolds are determined. The glass fluorescence emission (611, 628, 638, 662.5, 716.4 nm) lines are observed. The above lines are assigned to 4G11/2 → 4I11/2, 4F3/2 → 4I13/2, 4F5/2 → 4I13/2, 4F9/2 → 4I15/2, and 4F7/2 → 4I13/2 transitions respectively. Their emission cross sections are calculated. The transition 4F9/2 → 4I15/2 in the red spectral region has large radiative time, branching ratio, and stimulated emission cross section which indicates the suitability of glass system to be used in laser and electroluminescence applications.