The temperature dependences of delayed and prompt fluorescence spectra for anthracene doped phenanthrene crystals (2 X lo\* and less than lo6 M/M) have been studied :n the temperature range 77-293 K. The experimental results indicate that a shallow trap the depth of which is 250 cm-\* competes with
Effect of crystal defects on triplet-triplet annihilation in anthracene
β Scribed by Kohei Yokoi; Yujiro Ohba
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 330 KB
- Volume
- 129
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
The rate constants of triplet-triplet annihilation were measured in anthracene single crystals with various degrees of damage. It was found that, as with the singleexcitonic triplet decay rate, the doubleexcitonic triplet decay rate is severely affected by the presence of crystal defects. The experimental results were analyzed kinetically in the framework of triplet exciton trapping at crystal defects.
π SIMILAR VOLUMES
Delayed and prompt 5uorescekce spectra and delayed fluokscenctt decay data far ~0'5-106 M/M crystals of anfltracene in phenanthrene are report&d\* It is shown that these data indicate that a heterogeneous (host-dopant) annihiiation process takes place which produces the excited singlet state of -tie
The effect of anisotropic diffusion upon the geminate survival probability of a pair of neutral particles is discussed. A concise, if simple, expression for the bulk recombination rate coefficient is derived using an integral relationship between it and the geminate stival probability. The resultant
The effects of temperature and solvent on tile magnetic field dependence of delayed monomer and excimer fiuorescence of ~OXIX&CS in solution are disc- The field effect data elucidate the mecbnism of excimer formation in triplet-triPlet a3lialSticn.
The magnetic field modulation of the delayed fluorescence and of the photoconduction of 9,lO-dichloroanthracene was measured. The ener,? transfer from triplet exciton to trapped positive holes is shown to be responsible for the photodetrapping.