Crystal growth and optical characterization of chromium-doped l-arginine phosphate monohydrate
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2018
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Resumo
L-arginine phosphate monohydrate single crystals doped with Cr3+ ions (LAP:Cr) were grown by slow cooling
method, with dimensions up to 10 × 10 × 8 mm3
. Chromium ions induce a drastic reduction of overall growth
rate and produce a drastic change in LAP growth morphology. The functional groups of LAP:Cr crystals were
confirmed by FTIR analysis and compared with pure LAP. The optical band gap of LAP:Cr was determined from
UV-VIS-NIR transmittance spectrum. Optical absorption spectrum at room temperature and 10 K was measured
consisting of two large bands due to the 4
A2 → 4
T2 and 4
A2 → 4
T1 transitions and a narrower band attributed to
the 4
A2 → 2
E spin-forbidden transition, characteristic of Cr3+ ions. Luminescence spectra of pure and Cr3+-
doped samples were collected with excitation at wavelength of 350 nm and 335 nm. Emissions from host LAP
matrix and Cr3+ ions were observed. Excited with 350 nm the spectra reveal a broad intense band from 21000 to
26000 cm−1 region due to electronic transition from LAP ligand. The emission spectra of doped sample present
two broad bands centered at 12346 cm−1 and 13412 cm−1 from 2
E → 4
A2 and 4
T2 → 4
A2 transitions, characteristics of luminescence from Cr3+ ions. From these results the Racah and crystal-field Cr3+ parameters were
evaluated and comparing with those obtained in similar systems.
Descrição
Palavras-chave
Nonlinear optical crystal, LAP, Chromium, Luminescence, Crystal field
Citação
SANTANA, Ricardo C. et al. Crystal growth and optical characterization of chromium-doped l -arginine phosphate monohydrate. Physica B: condensed matter, Amsterdam, v. 545, p. 390-396, 2018. DOI: 10.1016/j.physb.2018.07.001. Disponível em: https://www.sciencedirect.com/science/article/pii/S0921452618304472. Acesso em: 15 dez. 2023.