Energy and Charge Transfer in Organic Semiconductors by H. Akamatu (auth.), Kohzoh Masuda, Marvin Silver (eds.)

By H. Akamatu (auth.), Kohzoh Masuda, Marvin Silver (eds.)

Great development has been made within the box of normal semiconductor physics and linked applied sciences. at the moment, if shall we use new fabrics resembling natural semiconductors development in electronics might be sped up. features of natural semiconductors which are greater to others are: i) excessive photo-conductivity less than irradiation besides low leakage present at nighttime, ii) excessive sensitivity of the conductivity to numerous gases and to strain. iii) chance of utilizing them within the amorphous nation, iv) danger of creating units of tremendous small dimension, v) huge number of the fabrics, which makes appropriate collection of fabric part effortless. a potential destiny improvement is a hugely conductive fabric that can be used for electrical energy transmission - and which would support clear up the various difficulties posed via transmission losses. The U.S.-Japan Seminar on power and cost move in natural Semiconductors was once held in Osaka Japan, 6-9 August, 1973. accomplished effects have been summarized and the course for the long run was once mentioned. details was once exchanged particularly freely and actively in a delightful surroundings. a few of the papers provided on the seminar are released the following yet regrettably a couple of couldn't be incorporated. it is going to provide us nice excitement if this seminar will be one step within the extra improvement of the examine during this field.

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The effect of reabsorption decreases with decreasing temperature but even at liquid helium temperature the effect still remains. II THE EFFECT OF HIGH DENSITY EXCITATION The effects of high density excitation on anthracene fluorescence are i} decrease in decay time, ii} saturation of the fluorescence with increasing excitation, iii) increase in the absorption coefficient and iv) change in the fluorescence spectrum. The decrease in decay time is due to singlet exciton-exciton interaction. The saturation of the fluorescence intensity is due to energy loss used to excite one exciton to higher energy level by two exciton collision.

Japan 20 1340 (1965). K. Gamo. K. Masuda and J. Yamaguchi: J. Phys. Soc. of Japan 22 1032 (1967). Y. Aoyagi. K. Masuda and S. Namba: J. Phys. Soc. of Japan 31 164 (1971). A. Little, this volume, p. 145. 57 III. THEORY GREEN FUNCTION OF AN EXCITON COUPLED WITH PHONONS IN MOLECULAR CRYSTALS Kaoru Iguchi Department of Chemistry, Waseda University 4-170, Nishiokubo, Shinjuku, Tokyo. Japan The Hamiltonian of an exciton interacting with phonons in molecular crystals is assumed as H = EL n. : an. + L' J -~ mTl rnn.

When some of the trapped carriers were released, : when the trapped carriers were cleaned out . ITOH AND K. 9 eV. 5 eV is the same as that of the singlet-triplet absorption spectrum in anthracene crystal. [6] Therefore, it is explained by the indirect release of the trapped holes by the interaction of them and triplet excitons. 8 eV is considered to be due to the interaction of the trapped holes and singlet excitons. The enhancement of the electron photocurrent due to the interaction of trapped electrons and two types of excitons was also observed.

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