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Luminescence mechanism and properties of white light PVK:MEH-BP-PPV polymer LED prepared by blending

SU-HUA YANG1,* , CHIEN-FA LEE1

Affiliation

  1. Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan, R.O.C.

Abstract

The white colour polymer was prepared by the binary blending technique and the polymer light emitting diode (PLED) with single emission layer was achieved by spin-coating method. By means of Förster energy transfer mechanism, the excitation energy was partially transferred from the blue light emitting poly(9-vinylcarbazole) (PVK) to the red emitting poly[2-methoxy-5-{2-etylhexyloxy}1,4-phenylenevinylene-co-(4,4’-biphenylene)] (MEH-BP-PPV), which resulted from poorly miscible effect and partially spectral overlap of polymers. A broad band white light emission with two emission peaks at 400 and 560 nm was obtained. The optimal composition weight ratio of PVK to MEH-BP-PPV for achieving the white light emission was 100 to 5. The CIE coordinates of the emission light were at x = 0.29, y = 0.33 when the PVK:MEH-BP-PPV blend was irradiated by an UV lamp. The turn-on voltage for the white light PVK:MEH-BP-PPV PLED was about 3.5 V, although the luminance was low and needed to be improved..

Keywords

Polymers, Luminescence, Absorption, Photoluminescence.

Submitted at: Feb. 27, 2007
Accepted at: July 15, 2007

Citation

SU-HUA YANG, CHIEN-FA LEE, Luminescence mechanism and properties of white light PVK:MEH-BP-PPV polymer LED prepared by blending, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 7, pp. 2078-2081 (2007)