Control of a White Organic Light Emitting Diode emission parameters using a single doped RGB active layer

• A simple WOLED for Solid State Lighting is proposed with high color stability.
• Energy transfer and electroluminescence dynamics of a single RGB layer for WOLEDs.
• White shade modulation and stability over large emitting areas and applied voltages.

Solid State Lighting technologies based on Organic Light Emitting Diodes, became an interesting focus due to their unique properties. The use of a unique RGB active layer for white emission, although simple in theory, shows difficulty to stabilize both CIE coordinates and color modulation. In this work, a WOLED using a simple RGB layer, was developed achieving a high color stability and shade modulation. The RGB matrix comprises a blue host material NPB, doped with two guests, a green (Coumarin 153) and a red (DCM1) in low concentrations. The RGB layer carrier dynamics allows for the white emission in low device complexity and high stability. This was also shown independent of the white shade, obtained through small changes in the red dopant resulting in devices ranging from warm to cool white i.e. an easy color tuning. A detailed analysis of the opto-electrical behavior is made.

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