The dual role of Cr3+ in trapping holes and electrons in lanthanide co-doped GdAlO3 and LaAlO3

Hongde Luo; Pieter Dorenbos

doi:10.1039/c8tc01100a

The dual role of Cr3+ in trapping holes and electrons in lanthanide co-doped GdAlO3 and LaAlO3

Journal of Materials Chemistry C ◽

10.1039/c8tc01100a ◽

2018 ◽

Vol 6 (18) ◽

pp. 4977-4984 ◽

Cited By ~ 12

Author(s):

Hongde Luo ◽

Pieter Dorenbos

Keyword(s):

Dual Role ◽

Photoluminescence Excitation ◽

Excitation Spectra ◽

Co Doped

We have obtained a consistent interpretation of the TL and photoluminescence excitation spectra of Cr3+ doped and Ln3+ co-doped GdAlO3 and LaAlO3.

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Photoluminescence Excitation Studies of the Optical Transitions in GaN

MRS Proceedings ◽

10.1557/proc-449-701 ◽

1996 ◽

Vol 449 ◽

Cited By ~ 4

Author(s):

D. Kovalev ◽

B. Averboukh ◽

B. K. Meyer ◽

D. Volm ◽

H. Amano ◽

...

Keyword(s):

Dominant Role ◽

Free Exciton ◽

Resonant Excitation ◽

Yellow Emission ◽

Optical Transitions ◽

Photoluminescence Excitation ◽

Excitation Spectra ◽

Free Carriers ◽

Shallow Impurities

ABSTRACTWe present a detailed photoluminescence excitation study of the optical transitions in GaN. This technique is employed to distinguish between band-to-band excitation and exciton contribution to the formation of the free exciton, bound exciton, violet and yellow photoluminescence bands. We show the dominant role of the Fröhlich polar intraband scattering in the formation of the free exciton states. We demonstrate that bound exciton states in a large extent are created by the capture of the free excitons by shallow impurities as well as by phononassisted resonant excitation of the bound exciton states. The capture of the free carriers excited in the band continuum is a main excitation source for the violet and yellow bands. However, distinct A- and C-exciton resonances are detected in the excitation spectra of the violet and yellow emission bands.

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Mn- and Fe- doped GaN for spintronic applications

MRS Proceedings ◽

10.1557/proc-1040-q06-09 ◽

2007 ◽

Vol 1040 ◽

Author(s):

Enno Malguth ◽

Axel Hoffmann ◽

Stefan Werner ◽

Matthew H. Kane ◽

Ian T. Ferguson

Keyword(s):

Magnetic Semiconductors ◽

Hexagonal Lattice ◽

Dilute Magnetic Semiconductors ◽

Spin Coupling ◽

Site Symmetry ◽

Photoluminescence Excitation ◽

Photoluminescence Spectra ◽

Excitation Spectra ◽

Jahn Teller ◽

Co Doped

AbstractIn the context of ferromagnetic spin-coupling in dilute magnetic semiconductors, we present optical investigations on Mg co-doped GaMnN and Fe doped GaN. A complex luminescence feature occurring in Mg co-doped GaMnN around 1 eV was previously attributed to the internal 4T2(F)—4T1(F) transition of Mn4+ involved in different complexes. Selective excitation studies indicate the presence of at least three different complexes. Photoluminescence excitation spectra suggest that the internal Mn3+ transition may represent an excitation mechanism. Magneto photoluminescence spectra indicate equal g values for the ground and excited state. Low temperature infrared absorption spectra of Fe doped GaN allow to unambiguously establish the electronic structure of the Fe2+ center in GaN. Our results suggest that the Fe2+(5T2) state is stabilized against Jahn-Teller coupling by the reduced site-symmetry of the hexagonal lattice.

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