The effect of injected charges on fluorescence of organic thin films c
onsisting of the donor molecule tetra(N,N-diphenyl-4-aminopheny-1)ethy
lene (TTPAE) was investigated. Fluorescence was efficiently quenched b
y charge injection. By comparison of fluorescence measurements and cur
rent measurements, it was found that hole injection had essential role
in fluorescence quenching and electron injection did not. Coulomb int
eraction between photoexcited molecules and injected carriers was foun
d to cause fluorescence quenching. (C) 1998 Elsevier Science S.A, All
rights reserved.