NEW FABRICATION METHOD FOR HIGHLY ORIENTED J-AGGREGATES DISPERSED IN POLYMER-FILMS

We present a new fabrication method, called ''vertical spin coating,'' to prepare highly oriented J aggregates dispersed in polymer films. L inear dichroic spectra of the oriented J aggregate of 1,1'-diethyl-2,2 '-quinocyanine bromide PIC-Br were measured at 5 K. The dichroic ratio at the peak of J band was 5 to 10, dependent on the preparation condi tions. Precise measurement of the dichroism at the J band revealed tha t the J band is composed of two bands with transition dipole moments p erpendicular to each other. The films are stable even at room temperat ure, and have applications as nonlinear optical devices.