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A doping-free organic light-emitting diode (OLED) with high power efficiency and simple device structure is reported, using a Pt(II)-based complex with near unity photoluminescence quantum yield and excellent electron transporting properties.

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Abstract

Today's state‐of‐the‐art phosphorescent organic light‐emitting diodes (PhOLEDs) must rely on the host‐guest doping technique to decrease triplet quenching and increase device efficiency. However, doping is a sophisticated device fabrication process. Here, a Pt(II)‐based complex with a near unity photoluminescence quantum yield and excellent electron transporting properties in the form of neat film is reported. Simplified doping‐free white PhOLED and yellow‐orange PhOLED based on this emitter achieve rather low operating voltages (2.2–2.4 V) and very high power efficiencies of approximately 80 lm W −1 (yellow‐orange) and 50 lm W −1 (white), respectively, without any light extraction enhancement. Furthermore, the efficient white device also exhibits high color stability. No color shift is observed during the entire operation of the device. Analysis of the device's operational mechanism has been postulated in terms of exciton and polaron formation and fate. It is found that using the efficient neat Pt(II)‐complex as a homogeneous emitting and electron transporting layer and an ambipolar blue emitter are determining factors for achieving such a high efficiency.

Key findings

  • Very high power efficiencies of approximately 80 lm W⁻¹ (yellow-orange) and 50 lm W⁻¹ (white) are achieved without any light extraction enhancement.
  • Low operating voltages of 2.2-2.4 V are achieved for both yellow-orange and white devices.
  • High color stability is observed in the efficient white device, with no color shift during operation.

Keywords

Common emitterPhosphorescent organic light-emitting diodeOptoelectronicsPhosphorescenceQuantum efficiencyOLED

Identifiers

DOI
10.1002/adfm.201400597
Journal
Advanced Functional Materials
Year
2014