TY - JOUR
T1 - Cathodoluminescence and polarization studies from individual dislocations in diamond
AU - Yamamoto, N.
AU - Spence, John
AU - Fathy, D.
N1 - Funding Information:
This work was supported by ARO Contract I)AAG29-83-K-0087 and the facilities of the NSF High Resolution Electron Microscopy Center at Arizona State University. We are grateful to Drs. R. Sauer, P. Pirouz, A. R. Lang and R. Labusch for useful discussions.
PY - 1984/6
Y1 - 1984/6
N2 - A cathodoluminescence detector attached to a transmission electron microscope has been used to record visible optical-emission spectra from individual dislocations of known type in type lib diamond over a range of temperatures. The polarization of the emission has also been determined from individual dislocations and this information correlated with the type and degree of dissociation of the dislocations. It was found that the dislocation emission at 435 nm was polarized along the dislocation line (independent of the Burgers vector) and had maximum intensity at 170 K. The emission spectrum was independent of dislocation type, and showed a broad (0·416 eV f.w.h.m.) band. All luminescent dislocations were dissociated, and one non-luminescent dislocation was found which was undissociated within the resolution of the weak-beam technique (-15 Å). Non-luminescent dissociated dislocations were also found. Curved dislocations were less luminescent than straight ones. A one-dimensional donor-acceptor model is suggested as being consistent with all these findings, which rule out several other proposed mechanisms.
AB - A cathodoluminescence detector attached to a transmission electron microscope has been used to record visible optical-emission spectra from individual dislocations of known type in type lib diamond over a range of temperatures. The polarization of the emission has also been determined from individual dislocations and this information correlated with the type and degree of dissociation of the dislocations. It was found that the dislocation emission at 435 nm was polarized along the dislocation line (independent of the Burgers vector) and had maximum intensity at 170 K. The emission spectrum was independent of dislocation type, and showed a broad (0·416 eV f.w.h.m.) band. All luminescent dislocations were dissociated, and one non-luminescent dislocation was found which was undissociated within the resolution of the weak-beam technique (-15 Å). Non-luminescent dissociated dislocations were also found. Curved dislocations were less luminescent than straight ones. A one-dimensional donor-acceptor model is suggested as being consistent with all these findings, which rule out several other proposed mechanisms.
UR - http://www.scopus.com/inward/record.url?scp=0021439724&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021439724&partnerID=8YFLogxK
U2 - 10.1080/13642818408227648
DO - 10.1080/13642818408227648
M3 - Article
AN - SCOPUS:0021439724
SN - 1364-2812
VL - 49
SP - 609
EP - 629
JO - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
JF - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
IS - 6
ER -