Luminescence properties of poly(p-phenylenevinylene) derivatives carrying directly attached hole-transporting carbazole and electron-transporting phenyloxadiazole pendants

Citation
Yr. Hong et al., Luminescence properties of poly(p-phenylenevinylene) derivatives carrying directly attached hole-transporting carbazole and electron-transporting phenyloxadiazole pendants, MACRO SYMP, 175, 2001, pp. 169-175
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR SYMPOSIA
ISSN journal
1022-1360 → ACNP
Volume
175
Year of publication
2001
Pages
169 - 175
Database
ISI
SICI code
1022-1360(200108)175:<169:LPOPDC>2.0.ZU;2-0
Abstract
New poly(p-phenylenevinylene) (PPV) derivatives (polymer 1 and 2) that carr y hole-transporting carbazole and electron-transporting phenyloxadiazole pe ndants were synthesized and their photo- and electroluminescence properties were studied. Polymer 1 is poly[2-(N-carbazolyl)-5-(2-ethylhexyloxy)-1,4-p henylenevinylene] that has both carbazole and 2-ethylhexyl pendant groups. And polymer 2 is poly[2-{4-[5-(4-t-butylphenyl)-1,3,4-oxadiazolyl]phenyl}-5 -(2-ethyihexyloxy)-1,4-phenytenevinylene], which bears the 2-(4-t-butylphen yl)-5phenyl-1,3,4-oxadiazole pendants. The optical properties of the polyme r films were studied by UV-vis absorption, photoluminescence (PL) and elect roluminescence (EL) spectroscopy. EL devices with the configuration of ITO/ poly(3,4-ethylenedioxy-2,5-thienylene) (PEDOT) polymer/Ca/Al were construct ed and the device performances were compared. Polymer 1 emits bright yellow ish green light (lambda (max) = 530 nm), whereas polymer 2 emits yellowish orange (lambda (max) = 540 nm) light. The device fabricated using polymer 1 showed a low turn-on electric field of 0.31 MV/cm and the maximum luminanc e of 30,390 cd/m(2) at 1.50 MV/cm. Polymer 2 exhibited a little poorer devi ce performance (turn-on electric field: 0.94 MV/cm; maximum luminance: 5,72 0 cd/m(2) 2 at 2.74 MV/cm). Maximum photometric efficiencies of the devices were 4.4 and 1.3 cd/A, respectively.