University of California

Jacek Ostrowski

Guillermo C Bazan

Alan J Heeger

Daniel Moses

Xiong Gong

Wanli Ma

Alexander Mikhailovsky

Monica Katiyar

White light-emitting electrophosphorescent polymeric light-emitting diodes (PLEDs) are demonstrated using semiconducting polymers blended with organometallic emitters as emissive materials in a common region. These materials may be cast from solution. The CIE coordinates, the color temperatures and the color rendering indices of the white emission are insensitive to the brightness, applied voltage and applied current density.

White electrophosphorescence from semiconducting polymer blends

Optoelectronic devices and methods for their fabrication having enhanced and controllable rates of the radiative relaxation of triplet light emitters are provided exemplified by organic light emitting devices based on phosphorescent materials with enhanced emission properties. Acceleration of the radiative processes is achieved by the interaction of the light emitting species with surface plasmon resonances in the vicinity of metal surfaces. Non-radiative F&#xf6;rster-type processes are efficiently suppressed by introducing a transparent dielectric or molecular layer between the metal surface and the chromophore. For materials with low emission oscillator strengths (such as triplet emitters), the optimal separation distance from the metal surface is determined, thus suppressing energy transfer and achieving a significant acceleration of the emission rate.

Plasmon assisted enhancement of organic optoelectronic devices

Growing community of inventors

Santa Barbara, CA, United States of America

Jacek Ostrowski