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Photoluminescence of poly(N-vinylcarbazole) thin films deposited by dip-coating technique

Rębarz M., Dalasiński P., Bała W., Łukasiak Z., Wojdyła M., Kreja L.

Optica Applicata

2005

Vol. 35, nr 3

407-412

This paper is concerned with the photoluminescence (PL) study of poly(N-vinylcarbazole) (PVK) thin films deposited on the glass substrate by the dip-coating method. The PL spectra have been measured under steady state excitation (He-Cd laser, 325 nm) in the temperature range from 13 to 300 K. All the samples being studied exhibit strong luminescence in broad temperature range. The main emission PL peak has maximum at 410 nm and is attributed to the excimer emission of PVK. We have observed a small red-shift of this peak with an increase of temperature. In all the films under investigation the thermal quenching of PL has been noticed. This behaviour is determined by the closeness of carbazole groups belonging to neighbouring chains because the interaction between them leads to nonradiative transitions. The PL spectra of PVK thin films annealed under iodine atmosphere have also been investigated. We have observed a decrease of PL for these films. We have concluded that the annealing of PVK under iodine atmosphere induces its degradation.

New pyrazoloquinolines and their application in organic light-emitting diodes with poly(N-vinylcarbazole) matrix

Gondek E., Sanetra J., Armatys P., Nizioł J., Chaczatrian K., Danel A.

Polimery

2004

T. 49, nr 3

163-167

There were synthesized six new pyrazoloquinoline derivatives (PAQ) described with a formula (I), in which the meanings of R4 substituent are as follows: -Br, -OC6H5, -CH3, -H, -OCH3, -Cl. The new compounds were characterized, among others, on the basis of 1H NMR spectra and elemental analyses results. Mixtures of these PAQ derivatives with poly(N-vinylcarbazole) were applied in the organic light-emitting diodes (LED). Spectra of absorption, photoluminescencc (PL) and electroluminescence (EL) of LEDs prepared were presented. It has been found that the type of R4 substituent influences PL and EL quantum yields.

Zsyntetyzowano sześć nowych pochodnych pirazolochinoliny (PAQ) o wzorze ogólnym (I), w którym podstawnik R4 ma następujące znaczenie -Br, -OC6H5, OCH3, -H, -CH3, -Cl. Te nowe związki scharakteryzowano m.in. na podstawie widm 1H NMR oraz wyników analizy elementarnej. W organicznych diodach elektroluminescencyjnych (LED) zastosowano mieszaniny tych pochodnych PAQ z poli(N-winylokarbazolem) (rys. 1). Przedstawiono widma absorpcji, fotoluminescencji (PL) oraz elektroluminescencji (EL) tych LED (rys. 2 i 3, tabela 1). Stwierdzono, że rodzaj podstawnika R4 wywiera wpływ na wydajność PL i EL (tabela 1).