On exciton absorption, band structure, and phase transformation of GaSe under pressure

1975 ◽  
Vol 72 (2) ◽  
pp. 823-831 ◽  
Author(s):  
V. V. Panfilov ◽  
S. I. Subbotin ◽  
L. F. Vereshchagin ◽  
I. I. Ivanov ◽  
R. T. Molchanova
Keyword(s):  
Phase Transformation ◽  
Absorption Band ◽  
Band Structure ◽  
Exciton Absorption ◽  
Exciton Absorption Band

EXCITONIC PHOTOLUMINESCENCE IN PENTACENE SINGLE CRYSTAL

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3753-3756 ◽  
Author(s):  
T. AOKI-MATSUMOTO ◽  
K. FURUTA ◽  
T. YAMADA ◽  
H. MORIYA ◽  
K. MIZUNO ◽  
...  
Keyword(s):  
Absorption Band ◽  
Single Crystals ◽  
Lower Energy ◽  
Luminescence Band ◽  
Laser Light ◽  
Stokes Shift ◽  
Photoluminescence Spectra ◽  
Exciton Luminescence ◽  
Exciton Absorption ◽  
Exciton Absorption Band

Photoluminescence of pentacene single crystals is studied in the temperature range of 7 K to 200 K under excitation with He-Ne laser light. Photoluminescence spectra consist of four broad bands, L1 to L4. The highest energy band, L1, located close to the lowest exciton absorption band mainly appears for //b-polarization. The intensity of the second one, L2, with Stokes-shift of about 1500 cm -1, decreases as temperature rises above 30 K and disappears at 100 K. The bands, L3 and L4, which are located at lower energy, are observed at higher temperatures up to 200 K. Based on their energy positions, the band L2 is assigned to a shallow self-trapped exciton luminescence band, and the bands L3 and L4 to deep self-trapped exciton luminescence bands. By comparing this result with reported result on tetracene crystals, self-trapped excitons are considered to be more stable in pentacene.

scholarly journals Temperature-induced shift of the exciton absorption band in InP/ZnS quantum dots

2017 ◽  
Vol 7 (2) ◽  
pp. 354 ◽  
Author(s):  
S. S. Savchenko ◽  
A. S. Vokhmintsev ◽  
I. A. Weinstein
Keyword(s):  
Quantum Dots ◽  
Absorption Band ◽  
Exciton Absorption ◽  
Exciton Absorption Band
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