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Polyfluorene light-emitting devices ...

He, Yi.

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Polyfluorene light-emitting devices and amorphous silicon:hydrogen TFT pixel circuits for active-matrix organic light-emitting displays.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Polyfluorene light-emitting devices and amorphous silicon:hydrogen TFT pixel circuits for active-matrix organic light-emitting displays./
Author:	He, Yi.
Description:	166 p.
Notes:	Source: Dissertation Abstracts International, Volume: 61-07, Section: B, page: 3751.
Contained By:	Dissertation Abstracts International61-07B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9977172
ISBN:	0599832312

Polyfluorene light-emitting devices and amorphous silicon:hydrogen TFT pixel circuits for active-matrix organic light-emitting displays.
He, Yi.

Polyfluorene light-emitting devices and amorphous silicon:hydrogen TFT pixel circuits for active-matrix organic light-emitting displays. - 166 p.

Source: Dissertation Abstracts International, Volume: 61-07, Section: B, page: 3751.

Thesis (Ph.D.)--University of Michigan, 2000.

Organic light-emitting devices (OLEDs) made of single-layer and double-layer polymer thin films have been fabricated and studied. The hole transporting (polymer A) and emissive (polymer B) polymers were poly(9,9' -dioctyl fluorene-2,7-diyl)-co-poly(diphenyl-p-tolyl-amine-4,4 '-diyl) and poly(9,9'-dioctyl fluorene-2,7-diyl)-co-poly(benzothiadiazole 2,5-diyl), respectively. The optical bandgaps of polymer A and B were 2.72 and 2.82 eV, respectively. The photoluminescence (PL) peaks for polymer A and B were 502 and 546 nm, respectively. The electroluminescence (EL) peak for polymer B was 547 nm. No EL has been observed from polymer A single layer OLEDs.

ISBN: 0599832312Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Polyfluorene light-emitting devices and amorphous silicon:hydrogen TFT pixel circuits for active-matrix organic light-emitting displays.
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100 1 $a He, Yi. $3 1918543
245 1 0 $a Polyfluorene light-emitting devices and amorphous silicon:hydrogen TFT pixel circuits for active-matrix organic light-emitting displays.
300 $a 166 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-07, Section: B, page: 3751.
500 $a Chair: Jerzy Kanicki.
502 $a Thesis (Ph.D.)--University of Michigan, 2000.
520 $a Organic light-emitting devices (OLEDs) made of single-layer and double-layer polymer thin films have been fabricated and studied. The hole transporting (polymer A) and emissive (polymer B) polymers were poly(9,9' -dioctyl fluorene-2,7-diyl)-co-poly(diphenyl-p-tolyl-amine-4,4 '-diyl) and poly(9,9'-dioctyl fluorene-2,7-diyl)-co-poly(benzothiadiazole 2,5-diyl), respectively. The optical bandgaps of polymer A and B were 2.72 and 2.82 eV, respectively. The photoluminescence (PL) peaks for polymer A and B were 502 and 546 nm, respectively. The electroluminescence (EL) peak for polymer B was 547 nm. No EL has been observed from polymer A single layer OLEDs.
520 $a To obtain the spectral distribution of the emission properties of the light-emitting devices, a new light-output measurement technique was developed. Using this technique, the spectral distribution of the luminance, radiance, photon density emission can be obtained. Moreover, the device external quantum efficiency calculated using this technique is accurate and insensitive to the light emission spectrum shape.
520 $a Organic light-emitting devices have been fabricated and studied on both glass and flexible plastic substrates. The OLEDs showed a near-linear relationship between the luminance and the applied current density over four orders of magnitude. For the OLEDs fabricated on the glass substrate, luminance &sim;9,300 cd/m2, emission efficiency &sim;14.5 cd/A, luminescence power efficiency &sim;2.26 lm/W, and external quantum efficiency &sim;3.85% have been achieved. For the OLEDs fabricated on the flexible plastic substrates, both aluminum and calcium were used as cathode materials. The achieved maximum OLED luminance, emission efficiency, luminescence power efficiency, and external quantum efficiency were &sim;13,000 cd/m2, &sim;66.1 cd/A, &sim;17.2 lm/W, and 16.7%, respectively.
520 $a To make an active-matrix organic light-emitting display (AM-OLED), a two-TFT pixel electrode circuit was designed and fabricated based on amorphous silicon TFT technology. This circuit was capable of providing continuous pixel excitation and a simple driving scheme. However, it showed an output current variation of &sim;40% to 80% due to the drive TFT threshold voltage (V th) shift after long-term operation. To improve the pixel circuit electrical reliability, a four-TFT pixel electrode circuit was proposed and fabricated. This circuit only showed an output current variation <1% for the high currents (>0.5muA) even when a TFT Vth shift as large as 3V was present. This four-TFT pixel electrode circuit was used to fabricate small size active-matrix monochrome organic light-emitting display.
590 $a School code: 0127.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Condensed Matter. $3 1018743
690 $a 0544
690 $a 0611
710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 61-07B.
790 1 0 $a Kanicki, Jerzy, $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2000
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9977172