High Current Density Injection into Polymer Light-Emitting Electrochemical Cells

Contact Injection into Polymer Light-Emitting Diodes

The variation of current I with voltage V for poly(phenylene vinylene) and other polymer light-emitting diodes has been attributed to carriers tunneling into broad conduction and valence bands. In actuality the electrons and holes tunnel into polaron levels and transport is by hopping among these levels. We show that for small injection the I-V characteristic is determined mainly by the image f...

Long-Lifetime Polymer Light-Emitting Electrochemical Cells

Polymer light-emitting devices have been divided into two general types: polymer light-emitting diodes (PLEDs) and polymer light-emitting electrochemical cells (PLECs). The advantages of PLEDs include a fast response and relatively long operating lifetime (with proper packaging). However, low-work-function cathodes and/or thin interfacial layers (e.g., LiF) between the metal and the emitting po...

Polymer light-emitting electrochemical cells: Doping, luminescence, and mobility

Ludvig Edman,1,* Melissa A. Summers,1,2 Steven K. Buratto,1,2 and Alan J. Heeger1,3 1Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93103, USA 2Department of Chemistry and Biochemistry, UCSB, Santa Barbara, California 93106, USA 3Department of Physics and Materials Department, UCSB, Santa Barbara, California 93106, USA (Received 10 F...

Optical-Beam-Induced-Current Imaging of Planar Polymer Light-Emitting Electrochemical Cells

In this chapter, we describe optical-beam-induced-current (OBIC) and scanning photoluminescence (PL) imaging of extremely large planar LECs that have been frozen to preserve the doping profile. This complements the basics described in Chap. 1 with respect to device mechanism and characterization. We succeeded in resolving the depletion width, for the first time, of a frozen LEC pn junction and ...

Electrochemical doping during light emission in polymer light-emitting electrochemical cells