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Concentration‐dependent studies of Nd 3 + ‐doped zinc phosphate glasses for NIR photoluminescence at 1.05 μm
Author(s) -
Reddy Prasad V.,
Seshadri M.,
Babu S.,
Ratnakaram Y. C.
Publication year - 2017
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3200
Subject(s) - photoluminescence , zinc , doping , zinc phosphate , phosphate , zinc compounds , analytical chemistry (journal) , radiochemistry , materials science , nuclear chemistry , chemistry , optoelectronics , environmental chemistry , metallurgy , organic chemistry
Nd 3 + ‐doped lead‐free zinc phosphate glasses with the chemical compositions (60‐ x ) NH 4 H 2 PO 4 + 20ZnO + 10BaF 2 + 10NaF + x Nd 2 O 3 (where x = 0.5, 1.0, 1.5, 2.0 and 2.5 mol%) were prepared using a melt quenching technique. Vibrational bands were assigned and clearly elucidated by Raman spectral profiles for all the glass samples. Judd–Ofelt (J–O) intensity parameters (Ω λ : λ = 2, 4, 6) were obtained from the spectral intensities of different absorption bands of Nd 3 + ions. Radiative properties such as radiative transition probabilities ( A R ), radiative lifetimes (τ R ) and branching ratios (β R ) for different excited states were calculated using J–O parameters. The near infrared (NIR) photoluminescence spectra exhibited three emission bands ( 4 F 3 /2 level to 4 I 13 /2 , 4 I 11 /2 and 4 I 9 /2 states) for all the concentrations of Nd 3 + ions. Various luminescence properties were studied by varying the Nd 3 + concentration for the three spectral profiles. Fluorescence decay curves of the 4 F 3 /2 level were recorded. The energy transfer mechanism that leads to quenching of the 4 F 3 /2 state lifetimes was discussed at higher concentration of Nd 3 + ions. These glasses are suggested as suitable hosts to produce efficient lasing action in NIR region at 1.05 μm.