Electronic polymers electroluminescent

Thin Films of Electroluminescent Polymers 335 Electronic Eneigy Structure 336 Optical Properties 336 Electrical Transport Properties 338... 

This chapter is organized as follows in Section 11.2 the relevant properties of electroluminescent polymer Films are summarized in Section 11.3 the electronic properties of mctal/polymer junctions are described in Section 11.4 single layer polymer LEDs are discussed in Section 11.5 multi-layer polymer LEDs are considered and Section 11.6 summarizes the conclusions. 

Electroluminescence (EL) studies done on CVP Polyazomethines indicated that it is primarily an electron transport polymer with a turn-on field -105 V/cm. This turn-on field is much better than that reported for solution processed PPV LEDs, and is in the same range as the some of the best values reported for the CVP-PPV. However, EL emission was only observed when a hole-transporting layer was introduced. They suggested that this might be due to the high ITO/polyazomethine energy barrier which injection of holes from the ITO electrode. ... 

Synthesis and Properties of Novel High-Electron-AfGnity Polymers for Electroluminescent Devices... 

In this article, we review the most recent research on such issues as the design and synthesis of novel electroluminescent polymers with high electron affinity, and of polymeric oxadiazoles with a strong tendency for n-doping, as well as those having high photoluminescence efficiency. Although most of this work was done in our latoratory, other important work is also included. 

Table in summarizes the CV results measured on ITO glass for four major electroluminescent polymers. Several points emerge from the data in Table HI (i) CN-PPV (10) and MEH-CN-PPV (39) are better electron acceptors than MEH-PPV (ca. 0.35-0.55 V respectively) (ii) CN-PPV and MEH-CN-PPV are better electron... 

Electrodes are chosen to facilitate the charge injections into the luminescent polymer layer. Thus, the use of additional polymer layers (i.e., making multilayer electroluminescence devices) raises the device efficiency. For example, using an electron-transporting (hole-blocking) layer between the cathode and the electroluminescent polymer moves the recombination of holes and electrons away from the... 

Only a decade after the first demonstration of electroluminescence in polymeric materials, the performance of PLEDs now appears to meet many of the requirements for applications at the low performance end of the display market, and the field has matured to the point of commercial exploitation the most current overview of the state-of-the-art can be foimd in an outstanding review (4). A number of electronics and polymer companies, including Cambridge Display Technology Ltd., Covion, Dow Chemical Co., Philips Electronics, and Uniax Corp., have... 

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