Abstract
Bright blue polymer light-emitting diodes have been fabricated by using the poly(p-phenylenevinylene)-based copolymers with 10 C long aliphatic chains as the electroluminescent layers, PBD in PMMA and Alq3 as the electron-transporting layers, and aluminum as the cathode. The multilayer structure devices show 190 cd/m2 light-emitting brightness at 460 nm, 15 V turn-on voltage. It is found that the intensities of photoluminescence and electroluminescence (EL) increase with increasing aliphatic chain length, the EL intensity and operation stability of these polymer light-emitting diodes can be improved by reasonable design of the structure.
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