Polarized luminescence study of ordered nonlinear optical material ZnGeP2

Autor:	R. L. Hengehold, J. E. McCrae, Peter G. Schunemann, M. C. Ohmer, Thomas M. Pollak, M. R. Gregg, Yung Kee Yeo, P. H. Ostdiek
Rok vydání:	1994
Předmět:	Materials science Photoluminescence Physics and Astronomy (miscellaneous) business.industry Cathodoluminescence Molecular physics Acceptor Wavelength Band diagram Optoelectronics Ground state Luminescence business Excitation
Zdroj:	Applied Physics Letters. 64:3142-3144
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.111345
Popis:	Polarized photoluminescence (PL) and cathodoluminescence studies have been made as a function of excitation laser wavelength or electron beam energy for the ordered nonlinear optical material ZnGeP2 grown by the Bridgman method. The luminescence signal is seen to be strongly polarized. Furthermore, several PL peaks appear on top of one large broad band, and the dominant peak shifts to a higher energy position as the excitation energy increases. This observation can be explained by the transitions from three conduction bands (Γ6, Γ7, Γ7) to acceptor level one triplet ground state levels which parody the top three valence subbands (Γ6, Γ7, Γ6). This explanation agrees well with the theoretical energy band diagram of this pseudodirect band‐gap material.
Databáze:	OpenAIRE
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