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Optical characterization of fourfold (Td)- and sixfold (Oh)-transition-metal species in MgAl2O4:Co2+ by time-resolved spectroscopy by L. Nataf; F. Rodríguez; R. Valiente; V. Ulanov is a Materials Science article available to read on EtoBox.
What is Optical characterization of fourfold (Td)- and sixfold (Oh)-transition-metal species in MgAl2O4:Co2+ by time-resolved spectroscopy about?
This work investigates the origin of novel visible photoluminescence (PL) bands observed in the spinel MgAl 2 O 4 :Co 2+ . Besides the well-known fourfold-coordinated Co 2+ (T d ) PL at 670 nm [N.V. Kuleshov, V.P. Mikhailov, V.G. Scherbitsky, P.V. Prokoshin and K.V. Yumashev, J. Lumin. 55 (1993) 265.], a rich structured PL band at 686 nm was also observed that we associate with uncontrolled impurities of sixfold coordinated Cr 3+ (O h ) by time-resolved spectroscopy and lifetime measurements and their variation with temperature. We also show that the lifetime of the Co 2+ (T d ) emission at 670 nm varies from t 1⁄4 6.7 ms to 780 ns on passing from T 1⁄4 10 to 290 K. This unexpected behaviour for T d systems is related to the excited-state crossover ( 4 T 1 2 2 E), making the emission band to transform from a narrowlike emission from 2 E at low temperature to a broad structureless band from 4 T 1 at room temperature.
Who reads Optical characterization of fourfold (Td)- and sixfold (Oh)-transition-metal species in MgAl2O4:Co2+ by time-resolved spectroscopy?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- L. Nataf; F. Rodríguez; R. Valiente; V. Ulanov
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2313)
- Published
- 2009
- Language
- EN
- Field
- Materials Science (Physical Sciences)