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Zn x Al 2 O 4 : Cr 3+ (0.1 mol%) crystals were synthesized by using sol gel method follow by the annealing treatment with temperatures ranging from 600 C to 1000 C. A series of emission peaks associated with the spin forbidden 2 E g 4 A 2g transition of Cr 3+ ions were observed at the range from 650 nm to 720 nm. With the Zn/Al molar ratio increasing, the results of X ray photoelectron spectra showed that the excess Al ions occupying tetrahedral sites decreased. Meanwhile the full width at half m aximum of emission peaks became m uch narrower, and the intensity ratio between R line and N line increased for all samples but decreased with the annealing temperature increasing..
Semiconductors ZnAl 2 O 4 crystals Spinel struc ture Photoluminescence.
A. P. ZHOU, D. ZHANG, Z. Q. GONG, Q. SHI, C. LI, The structure and photoluminescence performances of Zn x Al 2 O 4 :Cr 3+ crystals with various annealing temperatures, Optoelectronics and Advanced Materials - Rapid Communications, 12, 9-10, September-October 2018, pp.588-594 (2018).
Submitted at: May 30, 2017
Accepted at: Oct. 10, 2018