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Theoretical studies of organic light...

Wang, Dong.

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Theoretical studies of organic light emitting diodes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Theoretical studies of organic light emitting diodes./
Author:	Wang, Dong.
Description:	117 p.
Notes:	Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4903.
Contained By:	Dissertation Abstracts International61-09B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9987905
ISBN:	0599943076

Theoretical studies of organic light emitting diodes.
Wang, Dong.

Theoretical studies of organic light emitting diodes. - 117 p.

Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4903.

Thesis (Ph.D.)--Arizona State University, 2000.

This thesis deals with two topics in organic light emitting diodes (OLEDs). The first is related to the OLED degradation phenomena observed during a long-term (&sim;100 hours) forward stress. One common observation is the gradual increase of the diode driving voltage under forward bias. This trend reverses when the bias polarity is reversed, and the initial driving voltage can be recovered almost completely. The mobile ions are proposed to explain the phenomenon. By solving a system of transient equations governing the mobile ion motion under an external field, this writer obtained the transient mobile ion distributions and their contribution to the driving voltage through a simple equation. It is found that the mobile ion model with reasonable assumptions could very well explain the experimental results. Several cases involving space charge limited conduction and mobile ions are also studied and discussed. The second topic regards the fundamental concepts of carrier transport processes in OLEDs, and more generally, in disordered systems. A theoretical model based on exponential energy dependent mobility and density of states is proposed to describe the carrier transport in disordered organic materials. A power-law current-voltage relationship is derived and the power factor is found to depend on the half-width of the density of state distribution. The increased carrier concentration begins to populate higher mobility states, causing a higher averaged mobility. The combined effect of increased carrier concentration and the higher averaged mobility leads to the super-linear current-voltage relationship. Besides these two topics, a brief review of the field is also given at the beginning.

ISBN: 0599943076Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Theoretical studies of organic light emitting diodes.
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245 1 0 $a Theoretical studies of organic light emitting diodes.
300 $a 117 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4903.
500 $a Adviser: Jun Shen.
502 $a Thesis (Ph.D.)--Arizona State University, 2000.
520 $a This thesis deals with two topics in organic light emitting diodes (OLEDs). The first is related to the OLED degradation phenomena observed during a long-term (&sim;100 hours) forward stress. One common observation is the gradual increase of the diode driving voltage under forward bias. This trend reverses when the bias polarity is reversed, and the initial driving voltage can be recovered almost completely. The mobile ions are proposed to explain the phenomenon. By solving a system of transient equations governing the mobile ion motion under an external field, this writer obtained the transient mobile ion distributions and their contribution to the driving voltage through a simple equation. It is found that the mobile ion model with reasonable assumptions could very well explain the experimental results. Several cases involving space charge limited conduction and mobile ions are also studied and discussed. The second topic regards the fundamental concepts of carrier transport processes in OLEDs, and more generally, in disordered systems. A theoretical model based on exponential energy dependent mobility and density of states is proposed to describe the carrier transport in disordered organic materials. A power-law current-voltage relationship is derived and the power factor is found to depend on the half-width of the density of state distribution. The increased carrier concentration begins to populate higher mobility states, causing a higher averaged mobility. The combined effect of increased carrier concentration and the higher averaged mobility leads to the super-linear current-voltage relationship. Besides these two topics, a brief review of the field is also given at the beginning.
590 $a School code: 0010.
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773 0 $t Dissertation Abstracts International $g 61-09B.
790 1 0 $a Shen, Jun, $e advisor
790 $a 0010
791 $a Ph.D.
792 $a 2000
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