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Copolymer architectures containing donor and acceptor units for blue light-emitting diodes

M.-D. DAMACEANU1,* , M. BRUMA1

Affiliation

  1. "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda, 41A, Iasi-700487, Romania

Abstract

Here we describe a study of the properties of some polyoxadiazoles containing bulky fluorene units suitable for blue polymer light emitting diodes (LEDs). These copolymers present good solubility in convenient solvents such as NMP, DMF, DMAc and THF, allowing to obtain thin films by pouring the solutions of polymers onto glass substrates or silicon wafers. Very thin films as-deposited onto glass plates studied by AFM technique exhibit a free pinhole, very smooth surface and practically without defects, over a scanning range of 3 - 10 μm. All the copolymers show good thermal stability, up to 400 °C and glass transition temperature in the range of 144-173 °C. UV-vis absorption spectra of these polymers performed in very dilute solutions exhibit absorption peaks and shoulders in the range of 280 - 340 nm. Excited with UV light peaking at 360 nm, the polymers in solutions and in solid state show photoluminescence in the blue domain..

Keywords

Copoly(oxadiazole-fluorene-amide)s, Thin films, High thermostability, Blue photoluminescenece.

Submitted at: Oct. 1, 2008
Accepted at: Nov. 11, 2008

Citation

M.-D. DAMACEANU, M. BRUMA, Copolymer architectures containing donor and acceptor units for blue light-emitting diodes, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 11, pp. 3086-3090 (2008)