Abstract
We demonstrate an approach for improving the colour gamut of bottom-emission organic light-emitting diodes (OLEDs) through micro-cavity structure embedded cathodes. The devices with micro-cavity structure embedded cathodes showed an improved colour gamut of 91.5% (National Television System Committee (NTSC)), 95.8% (Adobe RGB), and 129.2% (sRGB), compared to those of the devices without micro-cavity structure embedded cathodes—59.2% (NTSC), 62.0% (Adobe RGB), 83.6% (sRGB). In addition, the performance of red, green, and blue devices are also investigated depending on the optical length of the micro-cavity structure.
Highlights
Organic light-emitting diodes (OLEDs) have received particular attention as a future display device for their many advantages such as their thinness, light weight, flexibility, high contrast ratio, and low power consumption [1,2,3]
The micro-cavity resonance effect is commonly used for the optical design of a device structure [8,9]
We report a simple method to enhance the colour purity of bottom-emission
Summary
Organic light-emitting diodes (OLEDs) have received particular attention as a future display device for their many advantages such as their thinness, light weight, flexibility, high contrast ratio, and low power consumption [1,2,3]. A large colour gamut means that the display can express much more luxuriant colours. Narrow EL spectra are required for a large colour gamut display because the colour purity increases as the full-width-half-maximum (FWHM) of EL spectra are reduced [7]. Optical design is needed to improve the colour purity of OLEDs. The micro-cavity resonance effect is commonly used for the optical design of a device structure [8,9]. Top-emission OLEDs typically use a thin-metal top electrode which has high reflectance as well as a highly reflective metal bottom electrode which enables a strong micro-cavity resonance effect [10].
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