OLEDs: light-emitting thin film thermistors revealing advanced self-heating effects

被引：0

作者：

Fischer, Axel ^{[1
]}

Koprucki, Thomas ^{[2
]}

Glitzky, Annegret ^{[2
]}

Liero, Matthias ^{[2
]}

Gaertner, Klaus ^{[3
]}

Hauptmann, Jacqueline ^{[4
]}

Reineke, Sebastian ^{[1
]}

Kasemann, Daniel ^{[1
]}

Luessem, Bjoern ^{[1
,5
]}

Leo, Karl ^{[1
]}

Scholz, Reinhard ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01062 Dresden, Germany

[2] Weierstr Inst WIAS, D-10117 Berlin, Germany

[3] Univ Svizzera Italiana, Inst Computat Sci, Adv Comp Lab, CH-6904 Lugano, Switzerland

[4] Fraunhofer Inst Organ Elect Electron Beam & Plasm, D-01109 Dresden, Germany

[5] Kent State Univ, Dept Phys, Kent, OH USA

来源：

ORGANIC LIGHT EMITTING MATERIALS AND DEVICES XIX | 2015年 / 9566卷

关键词：

Organic light-emitting diode OLED; Joule self-heating; Brightness inhomogeneity; Negative differential resistance; Electrothermal feedback; Lighting panel; Organic semiconductor; Large area; DIODES; EFFICIENCY; PROGRESS;

D O I：

10.1117/12.2186940

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Large area OLEDs show pronounced Joule self-heating at high brightness. This heating induces brightness inhomogeneities, drastically increasing beyond a certain current level. We discuss this behavior considering 'S'-shaped negative differential resistance upon self-heating, even allowing for 'switched-back' regions where the luminance finally decreases (Fischer et al., Adv. Funct. Mater. 2014, 2 4, 3367). By using a multi-physics simulation the device characteristics can be modeled, resulting in a comprehensive understanding of the problem. Here, we present results for an OLED lighting panel considered for commercial application. It turns out that the strong electrothermal feedback in OLEDs prevents high luminance combined with a high degree of homogeneity unless new optimization strategies are considered.

引用

页数：7

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