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Journal Article
Solution-Processible Blue-Light-Emitting Polymers Based on Alkoxy-Substituted Poly(Spirobifluorene)
- Authors
- Jeong Ik Lee, Hye Yong Chu, Hyo Young Lee, Ji Young Oh, Lee Mi Do, Tae Hyoung Zyung, Jae Min Lee, Hong Ku Shim
- Issue Date
- 2005-04
- Citation
- ETRI Journal, v.27, no.2, pp.181-187
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- Alkoxy-substituted poly(spirobifluorene)s and their copolymers with a triphenylamine derivative have been synthesized by Ni(0)-mediated polymerization. The polymers were well soluble in common organic solvents. Pure blue-light emissions without the long wavelength emission of poly(fluorene)s have been observed in the fluorescence spectra of polymer thin films. The fight emitting diodes with a device configuration of ITO/PEDT:PSS(30 nm)/polymer(60 nm)/LiF(1 nm)/Al(100 nm) have been fabricated. The electroluminescence spectra showed the blue emissions without the long wavelength emission as observed in the fluorescence spectra. The relatively poor electroluminescence quantum yield of the homopolymer (0.017%@20 mA/cm2) with color coordinates of (0.16,0.07) has been improved by the introduction of triphenylamine moiety, and the copalymer with triphenylamine derivative exhibited an electroluminescence quantum yield of 0.15% at 20 mA/cm2 with color coordinates of (0.16, 0.08). Moreover, the introduction of polar side chains to the spirobifluorene moiety enhanced the device performance and led to the quantum yields of 0.6 to 0.7% at 20 mA/cm2, although there was some expense of color purities.
- KSP Keywords
- Blue light-emitting, Device configuration, Electroluminescence spectra, Emitting diodes, Fluorescence spectra, Light-emitting polymers, Polymer thin films, Quantum Yield, Triphenylamine derivative, color coordinates, device performance