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A new band in Cr 3+ ‐doped MgAl 2 O 4 natural spinel at room temperature
Author(s) -
Phan TheLong,
Phan ManhHuong,
Yu SeongCho
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301918
Subject(s) - photoluminescence , spinel , doping , ion , materials science , crystal (programming language) , excitation , spectral line , wavelength , analytical chemistry (journal) , dipole , optoelectronics , chemistry , physics , metallurgy , organic chemistry , chromatography , quantum mechanics , astronomy , computer science , programming language
Time resolved photoluminescence spectra of natural MgAl 2 O 4 spinel doped with Cr 3+ ions have been investigated at room temperature in the wavelength range between 380 and 800 nm. Using several excitation sources from the different lasers we have observed a new band, namely K, with a peak of 15,547 cm −1 (643.2 nm) and the transition process of photoluminescent lines among the electronic levels of the Cr 3+ ion. In terms of the experimental results and the Tanabe‐Sugano diagram, we strongly propose that the K‐band originates from the electric dipole transition, 2 E g → 4 A 2g in the strong crystal field with Dq / B > 2.3. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)