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Titolo:
Kinetics of triplet-triplet annihilation in disordered organic solids on short time scale
Autore:
Bagnich, SA; Konash, AV;
Indirizzi:
Natl Acad Sci Belarus, Inst Mol & Atom Phys, Minsk 220072, Byelarus Natl Acad Sci Belarus Minsk Byelarus 220072 Phys, Minsk 220072, Byelarus
Titolo Testata:
CHEMICAL PHYSICS
fascicolo: 1, volume: 263, anno: 2001,
pagine: 101 - 110
SICI:
0301-0104(20010101)263:1<101:KOTAID>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXCITATION TRANSPORT KINETICS; CHARGE-TRANSFER CRYSTAL; DELAYED FLUORESCENCE; AMORPHOUS-SILICON; LUMINESCENCE; PORES; WIRES; RECOMBINATION; NAPHTHALENE; RELAXATION;
Keywords:
energy transport; triplet-triplet annihilation; disordered solids;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Bagnich, SA Natl Acad Sci Belarus, Inst Mol & Atom Phys, F Skaryna Ave 70,Minsk 220072, Byelarus Natl Acad Sci Belarus F Skaryna Ave 70 Minsk Byelarus 220072
Citazione:
S.A. Bagnich e A.V. Konash, "Kinetics of triplet-triplet annihilation in disordered organic solids on short time scale", CHEM PHYS, 263(1), 2001, pp. 101-110

Abstract

In the present paper, the results of the investigation of the decay kinetics of delayed luminescence of disordered chrysene on short times are presented. A strong deviation of the decay of both phosphorescence and annihilation delayed fluorescence from the exponential law is observed. This effect is shown to be due to the relaxation process of electronic excitation energyin the system with large energetic disorder. At the same time, the reaction of triplet-triplet annihilation is well described by the second-order classical equation with a time-independent rate coefficient. This permits concluding that delayed fluorescence results from the annihilation of triplet excitations cascading down in the system of energetically disordered centres, and this process is in no way spatially limited. The mechanisms leading to the power law of annihilation delayed fluorescence decay in the region oflow temperatures and their universality are also discussed. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/21 alle ore 16:01:57