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A study of light‐emitting diodes constructed with copolymers having cyclohexyl thiophene and hexyl thiophene units
Author(s) -
Saxena Vibha,
Shirodkar V. S.
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20000801)77:5<1051::aid-app12>3.0.co;2-a
Subject(s) - electroluminescence , copolymer , thiophene , materials science , light emitting diode , diode , photochemistry , polymer , optoelectronics , visible spectrum , quantum efficiency , polymer chemistry , chemistry , organic chemistry , nanotechnology , composite material , layer (electronics)
We report visible light emission from a diode made from copolymers of 3‐alkylthiophenes. These chemically synthesized copolymers exhibit improved electroluminescence and quantum efficiencies compared to poly (3‐cyclohexylthiophene). Good solubility of copolymers allows the fabrication of the light emitting diodes by spin‐cast polymer film. The devices emit greenish‐blue light in wavelength region of 550–580 nm, which is easily visible in poorly lighted room. The quantum efficiencies are in the range of 0.002 to 0.01% (photons per electron) at room temperature; which are significantly higher than corresponding values for poly(3‐cyclohexylthiophene) based light emitting diodes. The charge carrier mobility in the device is found to be 5.6 × 10 −4 cm 2 /Vs. ©2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 1051–1055, 2000