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Free Charges and Excitons in Stilbene Single Crystals Excited by Electron Pulses
Author(s) -
Kostin A. K.,
Savelev V. V.,
Vannikov A. V.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220870130
Subject(s) - exciton , atomic physics , excited state , excitation , oscillator strength , electron , absorption (acoustics) , relaxation (psychology) , luminescence , absorption band , chemistry , materials science , molecular physics , physics , condensed matter physics , optics , spectral line , optoelectronics , psychology , social psychology , quantum mechanics , astronomy , composite material
The kinetics of relaxation currents, light absorption, and luminescence after excitation of stilbene single crystals by a pulse of accelerated electrons with τ = 40 × 10 −9 s is measured. The excitation results in bulk generation of free charges and excitons. The microscopic mobilities are found to μ p = 2.2 cm 2 V −1 and μ, = 0.2 cm 2 V −1 s −1 . The radiation yield of the charges is G ( p, e ) = 0.25 ± 0.02, and of triplet excitons G ( T ) = 3.6. The optical absorption spectrum of triplet excitons is recorded, and it is found that v max = 2.22 × 10 4 cm −1 , the absorption coefficient K v max = 0.17 cm −1 , and the oscillator strength of the T 2 ← T 1 optical transition band f = 0.20. The probability of creation of charges .