23 February 2006 Red/blue electroluminescence from europium-doped organic light emitting diodes
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Red/Blue emitting organic light emitting diodes (OLED) devices have been obtained using a Europium-doped organic emitting layer (NPB:Eu). The Eu-doped OLEDs emit in 2 color ranges: a broad blue (~420-500nm) band due to NPB emission and a narrow red peak at 620nm due to Eu emission. The red/blue devices achieve a brightness ~13x more intense than a similarly structured green (Alq3) emitting OLED. These NPB:Eu emitting structures also reach a maximum efficiency of 0.2 cd/A at brightnesses above 100 cd/m2.
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Joshua A. Hagen, Wayne X. Li, James G. Grote, Andrew J. Steckl, "Red/blue electroluminescence from europium-doped organic light emitting diodes", Proc. SPIE 6117, Organic Photonic Materials and Devices VIII, 61170O (23 February 2006); doi: 10.1117/12.643894; https://doi.org/10.1117/12.643894

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