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Nd 3+ ‐Doped Lead Boro Selenate Glass: A New Efficient System for Near‐Infrared 1.06 μm Laser Emission
Author(s) -
Naresh Pathuri,
Kostrzewa Marek,
Brik Mikhail G.,
Reddy Annapureddy Siva Sesha,
Mohan Nutakki Krishna,
Kumar Vandana Ravi,
Piasecki Michal,
Veeraiah Nalluri
Publication year - 2020
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202000602
Subject(s) - analytical chemistry (journal) , raman spectroscopy , x ray photoelectron spectroscopy , infrared spectroscopy , scanning electron microscope , spectroscopy , absorption spectroscopy , infrared , chemistry , selenium , doping , absorption (acoustics) , materials science , nuclear magnetic resonance , physics , optics , chromatography , quantum mechanics , composite material , optoelectronics , organic chemistry
An exotic series of glasses with the composition 39PbO—(60– x )B 2 O 3 – x SeO 2 :1.0 Nd 2 O 3 (10 ≤ x ≤ 50) is prepared and characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X‐ray spectroscopy (EDS) techniques. Results of infrared (IR), Raman, and X‐ray photoelectron spectroscopy (XPS) studies reveal that the glass network comprises quarantined selenite [SeO 3 ] 2− groups (that act as modifiers) and selenate [SeO 4 ] 2− groups in addition to BO 3 and BO 4 units. With the increase in SeO 2 content, the concentration of selenite groups is found to be dominant. The optical absorption (OA) spectra exhibit several bands due to 4 I 9/2 → 2 P 1/2 , 2 G 9/2 , 4 G 9/2,7/2,5/2 , 2 H 11/2 , and 4 F 9/2, 7/2,5/2,3/2 transitions. The spectra are characterized using J–O theory and J–O parameters are found to follow the order: Ω 2 > Ω 6 > Ω 4 . The emission spectra recorded at λ exc = 808 nm exhibit bands due to 4 F 3/2 → 4 I 9/2 , 4 I 11/2 , and 4 I 13/2 transitions. With increase in SeO 2 content, intensity of all emission bands significantly increases. The quantum efficiency evaluated from the measured and calculated lifetimes of the 4 F 3/2 → 4 I 11/2 transition is found to be enhanced by 20% with increase in SeO 2 from 10 to 50 mol%. The spectra are further analyzed quantitatively using kinetic rate equations of various excited levels and the reasons for enhancement of photoluminescence (PL) emission are identified and discussed.