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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 10,
  • Issue 7,
  • pp. 548-552
  • (2014)

Inverted Hybrid Inorganic–Organic Light-Emitting Diodes With Balanced Charge Injection

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Abstract

Green phosphorescent inverted hybrid inorganic-organic light-emitting diodes (IHyLEDs) based on a simplified organic layer/ ${{WO}}_{3}$ structure have been demonstrated. The ${{WO}}_{3}$ layer enabled facile hole injection and transport, which was balanced by efficient electron injection from the indium-tin-oxide (ITO) cathode overcoated with nanometer-thick Ca. The IHyLEDs had a turn-on voltage of 6 V. At 20 ${{mA}}/{{cm}}^{2}$ , it reached a luminance of 8133 ${{cd}}/{{m}} ^{2}$ and a current efficiency of 40 cd/A, which were 43% higher than a similar IHyLED with a conventional Al/LiF electron injection layer. The IHyLEDs with Ca also exhibited improved reliability under constant-current stressing at 20 ${{mA}}/{{cm}}^{2}$ .

© 2014 IEEE

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