NDLI: Charge transport in blue polymer Light-Emitting Diodes

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Charge transport in blue polymer Light-Emitting Diodes

Content Provider	Semantic Scholar
Author	Mensfoort, Van Slm Siebe
Copyright Year	2005
Abstract	This report covers the research project performed at Philips Research Laboratories Eindhoven by Siebe van Mensfoort in the period between April 2004 and January 2005 under supervision of Reinder Coehoorn and Simone Vul to. The main purpose of this research project is the identification of the physical processes and the determination of the relevant device parameters that describe the carrier transport in blue polymer light-emitting diodes by a combination of experiments and modeling. The results are then a basis for future work related to the lifetime and efficiency of these devices. Fur this purpose, we carried out current-voltage(-luminance) measurements on socalled hole-only and double-carrier devices with six different light-emitting polymer layer thicknesses in a wide temperature span. In addition, we carried out photocurrent , impedance and electro-absorption measurements in order to more fully characterize these devices and we studied the effect of illumination and electrical stress on the device characteristics. Unexpectedly, we find a clear shift of approximately 1.5 Vin the builtin voltage of gold-cathode hole-only devices under illumination and after electrical stress. Furthermore, we find that a conventional field-dependent mobility model reproduces the experimentally found current-voltage characteristics reasonably well and that the incorporation of a novel carrier concentration-dependent mobility in our numerical device model gives results consistent with experiments as a function of temperature, although discrepancies are found .
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://pure.tue.nl/ws/files/46936342/640351-1.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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