Efficient white OLEDs employing red, green, and blue tetradentate platinum phosphorescent emitters

• WOLED employing Pt-based red, green, and blue phosphorescent emitters is studied.
• The CIE coordinates of (0.35, 0.35) and CRI value of 80 are achieved.
• The maximum external quantum efficiency of 21.0 % and the maximum power efficiency of 41 lm/W are achieved.
• The first Pt-based RGB multi-layer WOLED that demonstrates the external quantum efficiency over 21.0 %.

The development of white organic light-emitting diodes (WOLEDs) employing three tetradentate platinum-based emitters, PtN3N-ptb (red), PtON1 (blue), and PtOO8 (green), is described. Spectral and electrical results show that localization of charge buildup, energy transfers between dopants, and concentration-dependence of spectral shape are all major factors in determining the overall color quality of a device. WOLEDs are fabricated by optimizing the thickness of emissive layers, the concentration of dopants, and the stacking order of emissive layers. Ultimately, the device employing 6% PtN3N-ptb(red)/6% PtON1(blue)/6% PtOO8(green) stacking order of emissive layers demonstrates the Commission Internationale de L’Éclairage coordinates (CIE) coordinates of (0.35, 0.35) and Color Rendering Index (CRI) value of 80, peak Power Efficiency (PE) of 41 lm/W, and maximum External Quantum Efficiency (EQE) of 21.0%.

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