Local structures around Mn luminescent centers in Mn-doped nanocrystals of ZnS

Journal Article · Thu Sep 15 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.7602· OSTI ID:7050407

Soo, Y L; Ming, Z H; Huang, S W; Kao, Y H ^[1]; Bhargava, R N ^[2]; Gallagher, D ^[3]

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1. Department of Physics, State University of New York at Buffalo, Buffalo, New York 14260 (United States)
2. Nanocrystals Technology, P.O. Box 820, Briarcliff Manor, New York 10510 (United States)
3. Philips Laboratories, Philips Electronics North America Corporation, 345 Scarborough Road, Briarcliff Manor, New York 10510 (United States)

X-ray-absorption fine-structure measurements were carried out to probe the local environment surrounding Mn ions in Mn-doped nanocrystals of ZnS with different size distributions ranging from 30--35 A to 50--55 A. The interatomic distances between Mn and neighboring atoms, the coordination number, local disorder, and effective valency determined for the nanocrystals are compared with those in bulk Mn-doped ZnS. The Mn ions are found to substitute for the Zn sites in the host ZnS but with significant size-dependent local structural changes. The questions of Mn-cluster formation and the presence of Mn impurities on the surface of the nanocrystals are addressed. Near-edge x-ray-absorption fine structures indicate that the effective valency of Mn ions in the nanocrystals is close to +2 with a weak size dependence. These local structures are believed to be closely related to the novel optical properties observed in this new class of semiconductors.

• DOE Contract Number: FG02-86ER45231
• OSTI ID: 7050407
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:11; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ABSORPTION SPECTROSCOPY
ALLOYS
CHALCOGENIDES
COORDINATION NUMBER
DISTANCE
ELECTROMAGNETIC RADIATION
INTERATOMIC DISTANCES
IONIZING RADIATIONS
LUMINESCENCE
MANGANESE ADDITIONS
MANGANESE ALLOYS
RADIATIONS
SELENIDES
SELENIUM COMPOUNDS
SPECTROSCOPY
X RADIATION
ZINC COMPOUNDS
ZINC SELENIDES