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Proceedings Paper

Multilayer white lighting polymer light-emitting diodes
Author(s): Xiong Gong; Shu Wang; Alan J. Heeger
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Paper Abstract

Organic and polymer light-emitting diodes (OLEDs/PLEDs) that emit white light are of interest and potential importance for use in active matrix displays (with color filters) and because they might eventually be used for solid-state lighting. In such applications, large-area devices and low-cost of manufacturing will be major issues. We demonstrated that high performance multilayer white emitting PLEDs can be fabricated by using a blend of luminescent semiconducting polymers and organometallic complexes as the emission layer, and water-soluble (or ethanol-soluble) polymers/small molecules (for example, PVK-SO3Li) as the hole injection/transport layer (HIL/HTL) and water-soluble (or ethanol-soluble) polymers/small molecules (for example, t-Bu-PBD-SO3Na) as the electron injection/transport layer (EIL/HTL). Each layer is spin-cast sequentially from solutions. Illumination quality light is obtained with stable Commission Internationale d'Eclairage coordinates, stable color temperatures, and stable high color rendering indices, all close to those of "pure" white. The multilayer white-emitting PLEDs exhibit luminous efficiency of 21 cd/A, power efficiency of 6 lm/W at a current density of 23 mA/cm2 with luminance of 5.5 x 104 cd/m2 at 16 V. By using water-soluble (ethanol-soluble) polymers/small molecules as HIL/HTL and polymers/small molecules as EIL/ETL, the interfacial mixing problem is solved (the emissive polymer layer is soluble in organic solvents, but not in water/ ethanol). As a result, this device architecture and process technology can potentially be used for printing large-area multiplayer light sources and for other applications in "plastic" electronics. More important, the promise of producing large areas of high quality white light with low-cost manufacturing technology makes the white multilayer white-emitting PLEDs attractive for the development of solid state light sources.

Paper Details

Date Published: 5 December 2006
PDF: 11 pages
Proc. SPIE 6333, Organic Light Emitting Materials and Devices X, 633312 (5 December 2006); doi: 10.1117/12.694380
Show Author Affiliations
Xiong Gong, Univ. of California, Santa Barbara (United States)
Shu Wang, Institute of Chemistry (China)
Alan J. Heeger, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 6333:
Organic Light Emitting Materials and Devices X
Zakya H. Kafafi; Franky So, Editor(s)

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