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Influence of Ho 2 O 3 on Optimizing Nanostructured Ln 2 Te 6 O 15 Anti ‐Glass Phases to Attain Transparent TeO 2 ‐Based Glass‐Ceramics for Mid‐IR Photonic Applications
Author(s) -
Gupta Gaurav,
Bysakh Sandip,
Balaji Sathravada,
Khan Sultan,
Biswas Kaushik,
Allu Amarnath R.,
Annapurna Kalyandurg
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901357
Subject(s) - materials science , raman spectroscopy , transmission electron microscopy , nanostructure , lanthanide , doping , phase (matter) , luminescence , nanotechnology , analytical chemistry (journal) , chemical engineering , ion , crystallography , optoelectronics , optics , chemistry , physics , organic chemistry , quantum mechanics , engineering , chromatography
The transparent TeO 2 ‐based glass‐ceramics (GCs) have yet to achieve the breakthrough in photonic technologies, because of poor understanding in optimizing the growth of nanostructured crystalline phases. In the present investigation, the size effect of phase‐separation‐induced, nanostructured Ln 2 Te 6 O 15 ‐based (Ln: Gd, Ho) “ anti ‐glass” phase in Ho 2 O 3 ‐modified TeO 2 ‐based TTLG (in mol%, 80TeO 2 10TiO 2 5La 2 O 3 5Gd 2 O 3 ) glass has considered to achieve transparent GCs. Raman study of TTLG glass reveals the presence of TeO 3 , TeO 3 + 1 , and TeO 4 units with average TeO coordination number as 3.49. The formation of nanostructured Ln 2 Te 6 O 15 phases in GCs is confirmed by X‐ray diffraction (XRD) and transmission electron microscopy (TEM) analysis. Furthermore, TEM analysis confirms that an increase of Ho 2 O 3 concentration has reduced the size of phase‐separated domains in nanoscale with superstructure formation to attain transparent GCs. The superiority of this obtained transparent GCs as photonic material for near‐IR (NIR) to mid‐IR (MIR) range has been established by the realization of enhanced luminescence intensities and bandwidth at ≈2900 nm (Ho 3+ : 5 I 6 → 5 I 7 ) and ≈2050 nm (Ho 3+ : 5 I 7 → 5 I 8 ). This study offers an opportunity to fabricate the various accessible lanthanide ions‐doped and/or co‐doped TTLG glass with control over nanostructure, to design a series of GCs which are transparent from visible to MIR range.