Abstract
Abstract It has been shown that the delayed and normal fluorescence can be measured accurately by a usual flash apparatus. Such measurements, combined with that of T–T absorption, have enlarged the potentiality of a flash technique to a large extent. As an example, a simple method of differentiation between E-type and P-type delayed fluorescence has been presented. Detailed studies have been made on the T–T annihilation process of anthracene (A) and the probability for Process AT+AT→A+A*, has been decided. The value obtained is 0.077±0.005. E-Type delayed fluorescence of eosine and proflavine have been studied and the value of kt·φST (kt, the rate constant of Process, T\ightharpoonupS*; φST, the probability of the intersystem crossing) have been evaluated, to be 3.36 and 2.78 sec−1 respectively. Some advantages of the present method over the sector method have been discussed.
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