Photoluminescence and Electroluminescence of a Non-Conjugated Polymer 6FPBO-OD.
Abstract
We present the experimental results of photoluminescence (PL) and the light emitting diode (LED) fabrication and characterization of a non-conjugated polymer 6FPBO-OD. This polymer is a variation of a conjugated rigid-rod polymer PBO, but soluble in many common organic solvents. The PL spectra (greenish-blue to the eye) of this system in solution (chlorobenzene, xylene, and chloroform) have two distinguishable peaks at ~ 440 nm and ~ 570 nm and a shoulder at ~ 610 nm. The PL spectra of spin cast films feature a red shift of the first peak to about 480 - 500 nm and a substantial decrease of the second peak with no apparent red shift. We fabricated both single and double layer devices. Poly(vinyl carbazole) (PVK) was used as a hole transport material in the double layer devices which have a greatly increased EL output compared to the single layer devices, suggesting that 6FPBO-OD is an electron transport material. The EL spectra are similar to the film PL spectra (bluish-white), while the device turn-on voltage varies from 5 to 15 volts depending on the thickness of the sample. Optical absorption and PL quantum yield in both solutions and films, EL efficiencies and brightness, and other multilayer and blend LED configurations involving 6FPBO-OD are discussed.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR..M703D