PHOTOPHYSICAL PROPERTIES, SELF-ASSEMBLED THIN-FILMS, AND LIGHT-EMITTING-DIODES OF POLY(P-PYRIDYLVINYLENE)S AND POLY(P-PYRIDINIUM VINYLENE)S

被引:38
作者
TIAN, J
WU, CC
THOMPSON, ME
STURM, JC
REGISTER, RA
机构
[1] PRINCETON UNIV, ADV TECHNOL CTR PHOTON & OPTOELECTR MAT, DEPT CHEM, PRINCETON, NJ 08544 USA
[2] UNIV SO CALIF, DEPT CHEM, LOS ANGELES, CA 90089 USA
[3] PRINCETON UNIV, ADV TECHNOL CTR PHOTON & OPTOELECTR MAT, DEPT ELECT ENGN, PRINCETON, NJ 08544 USA
[4] PRINCETON UNIV, ADV TECHNOL CTR PHOTON & OPTOELECTR MAT, DEPT CHEM ENGN, PRINCETON, NJ 08544 USA
关键词
D O I
10.1021/cm00059a030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Poly(p-pyridylvinylene) (PPyV) and its derivatives have been synthesized, and their optical properties have been studied in solutions and thin films. These conjugated polymers are highly photoluminescent in both their neutral and protonated states. Polymer thin films and concentrated solutions show photoluminescence (PL) from excimeric states, which contributes to the observed red-shift in the emission spectra and the low PL quantum yields relative to dilute solutions. Self-assembled polymer thin films of poly(pyridinium vinylene) with sulfonated polystyrene or sulfonated polyaniline have been prepared by the electrostatic deposition method. Various deposition conditions were investigated and the films examined by atomic force microscopy (AFM). Light-emitting devices (LEDs) with several different architectures were made from this class of polymers and evaluated. The polymer thin films were spin-coated from solution, and the devices emit generally orange-red colors consistent with their PL spectra. The device made from poly(3-n-butyl-p-pyridylvinylene) with the configuration ITO/Bu-PPyV/Al has an external quantum efficiency of 0.02%. The introduction of a hole transport layer (poly(p-phenylenevinylene), PPV) between the Bu-PPyV and ITO layers improves the quantum efficiency of the device (up to 0.05%), reduces the operating voltage and prolongs the life of the device.
引用
收藏
页码:2190 / 2198
页数:9
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