Abstract
II-VI strained-layer superlattices are very efficient emitters of visible light. The dependence of the luminescence intensity on the excitation power density allows us to characterise the recombination processes involved in the emission. At low temperatures excitonic processes are dominant whereas electron-hole recombinations feature at room temperature. No special evidence of the dual nature of the emission is observed at intermediate temperatures because the optical transitions are broadened by well-width fluctuations. In spite of this we may estimate the exciton binding energy from the temperature dependence of the photoluminescence intensity, as long as the photoluminescence remains excitonic. This is the case for narrow wells in CdSZnS superlattices over the temperature range zero to room temperature. The estimated exciton binding energy measured in this way approaches the two dimensional limit but does not exceed it.
| Original language | English |
|---|---|
| Pages (from-to) | 461-465 |
| Number of pages | 5 |
| Journal | Superlattices and Microstructures |
| Volume | 9 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Jan 1991 |
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Keywords
- strained layer superlattice
- luminescence
- exciton luminescence
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Exciton binding energies in II-VI compound strained layer superlattices. / Yang, F.; Parbrook, P. J.; Trager, C.; Henderson, B.; O'Donnell, K. P.; Wright, P. J.; Cockayne, B.
In: Superlattices and Microstructures, Vol. 9, No. 4, 01.01.1991, p. 461-465.Research output: Contribution to journal › Article
TY - JOUR
T1 - Exciton binding energies in II-VI compound strained layer superlattices
AU - Yang, F.
AU - Parbrook, P. J.
AU - Trager, C.
AU - Henderson, B.
AU - O'Donnell, K. P.
AU - Wright, P. J.
AU - Cockayne, B.
PY - 1991/1/1
Y1 - 1991/1/1
N2 - II-VI strained-layer superlattices are very efficient emitters of visible light. The dependence of the luminescence intensity on the excitation power density allows us to characterise the recombination processes involved in the emission. At low temperatures excitonic processes are dominant whereas electron-hole recombinations feature at room temperature. No special evidence of the dual nature of the emission is observed at intermediate temperatures because the optical transitions are broadened by well-width fluctuations. In spite of this we may estimate the exciton binding energy from the temperature dependence of the photoluminescence intensity, as long as the photoluminescence remains excitonic. This is the case for narrow wells in CdSZnS superlattices over the temperature range zero to room temperature. The estimated exciton binding energy measured in this way approaches the two dimensional limit but does not exceed it.
AB - II-VI strained-layer superlattices are very efficient emitters of visible light. The dependence of the luminescence intensity on the excitation power density allows us to characterise the recombination processes involved in the emission. At low temperatures excitonic processes are dominant whereas electron-hole recombinations feature at room temperature. No special evidence of the dual nature of the emission is observed at intermediate temperatures because the optical transitions are broadened by well-width fluctuations. In spite of this we may estimate the exciton binding energy from the temperature dependence of the photoluminescence intensity, as long as the photoluminescence remains excitonic. This is the case for narrow wells in CdSZnS superlattices over the temperature range zero to room temperature. The estimated exciton binding energy measured in this way approaches the two dimensional limit but does not exceed it.
KW - strained layer superlattice
KW - luminescence
KW - exciton luminescence
UR - http://www.scopus.com/inward/record.url?scp=0025721761&partnerID=8YFLogxK
U2 - 10.1016/0749-6036(91)90171-M
DO - 10.1016/0749-6036(91)90171-M
M3 - Article
AN - SCOPUS:0025721761
VL - 9
SP - 461
EP - 465
JO - Superlattices and Microstructures
JF - Superlattices and Microstructures
SN - 0749-6036
IS - 4
ER -