Tetraalkoxylated-PPV derivative: An efficient and pure green electroluminescent polymer with good solution processability
Tetraalkoxylated-PPV derivative: An efficient and pure green electroluminescent polymer with good solution processability
이지훈(한국교통대학교); In-Seo Kee(Samsung Advanced Institute of Technology); 강인남(가톨릭대학교); Jhun-Mo Son(Samsung Advanced Institute of Technology); Kyu-Sik Kim(Samsung Advanced Institute of Technology); Moo-Jin Park(Kumoh National Institute of Technology); 황도훈(금오공과대학교)
9권 4호, 861~865쪽
초록
A new solution-processable tetraalkoxy-substituted poly(1,4-phenylenevinylene) derivative, poly{[2- (3',7'-dimethyloctyloxy)-3,5,6-trimethoxy]-1,4-phenylenevinylene} (TALK-PPV), was synthesized through a dehydrohalogenation polymerization route, and its light-emitting properties were investigated. The TALK-PPV showed highly blue-shifted UV–visible absorption and PL emission spectra compared to the dialkoxy-substituted PPV derivatives. This is because of the disturbance to the p-conjugation caused by a steric hindered structure. The TALK-PPV thin film exhibited an absorption peak at 446 nm, with an onset at 515 nm. Its PL emission maximum was at 554 nm. Cyclic voltammetric analysis showed the HOMO and LUMO energy levels of the TALK-PPV to be 5.77 and 3.36 eV, respectively. Light-emitting devices were fabricated with an ITO (indium-tin oxide)/PEDOT/polymer/Ca/Al configuration. The TALK-PPV component leads to pure green light emission with a CIE 1931 chromaticity of (0.20, 0.74) at 100 cd/㎡ brightness, which is very close to the standard green (0.21, 0.71) demanded by the NTSC (National Television System Committee). The maximum brightness of this device was 24,900 cd/㎡ with an efficiency of 1.45 cd/A.
Abstract
A new solution-processable tetraalkoxy-substituted poly(1,4-phenylenevinylene) derivative, poly{[2- (3',7'-dimethyloctyloxy)-3,5,6-trimethoxy]-1,4-phenylenevinylene} (TALK-PPV), was synthesized through a dehydrohalogenation polymerization route, and its light-emitting properties were investigated. The TALK-PPV showed highly blue-shifted UV–visible absorption and PL emission spectra compared to the dialkoxy-substituted PPV derivatives. This is because of the disturbance to the p-conjugation caused by a steric hindered structure. The TALK-PPV thin film exhibited an absorption peak at 446 nm, with an onset at 515 nm. Its PL emission maximum was at 554 nm. Cyclic voltammetric analysis showed the HOMO and LUMO energy levels of the TALK-PPV to be 5.77 and 3.36 eV, respectively. Light-emitting devices were fabricated with an ITO (indium-tin oxide)/PEDOT/polymer/Ca/Al configuration. The TALK-PPV component leads to pure green light emission with a CIE 1931 chromaticity of (0.20, 0.74) at 100 cd/㎡ brightness, which is very close to the standard green (0.21, 0.71) demanded by the NTSC (National Television System Committee). The maximum brightness of this device was 24,900 cd/㎡ with an efficiency of 1.45 cd/A.
- 발행기관:
- 한국물리학회
- 분류:
- 물리학