blue for the


Organic Light Emitting diode (OLED) displays are very widely spread: smartphones, TVs, cars, virtual reality… Like in in any other displays OLED displays require three primary colours red, green and blue. Then the mixing of those colours can give any desirable colour or shade. 

"O" in OLED stands for organic. In commercial OLEDs organic layers are evaporated in between two electrodes to which the voltage is applied in order to inject current or charges into those organic layers. Then charges recombine to create light in light emitting red, green, blue layers.



However, in organic materials the very organic carbon bonds do break by generating hard – means high energy - blue light. The blue has been the critical weak point ever since the commercialization of OLED displays. For example, rollable OLED TVs are great, but actually do not receive high energy star ratings because the current blue emitters are inefficient. This poor efficiency as well makes to charge a mobile every night. Blue OLED emitters do not last very long, which is known as burn-in. A smart watch is switching off as soon as one does not look at it and this is done to prevent the blue colour from fading too quickly. Thus, the instability (TADF, Phosphorecent) or efficiency (fluorescent) of currently used blue emitters is an inherent problem of using organic materials.
Intra-metallic transition

for efficiency

AND stability

Completely different to everybody else, we at beeOLED designed the emitter around a single atom. All the light generation happens inside this one atom. No chemical bond is involved. So it's fundamentally impossible to break anything here. At the same time, the light generation of our atom is 100% efficient. Therefore, this really is the holy grail of OLED: a highly efficient blue emitter with nearly unlimited stability potential.
Leveraging the latest advances in Europium chemistry, and by using innovative organic ligands, beeOLED developed a series of highly stabilized blue Eu(II) complexes that are sufficiently air-stable, have nearly unity photoluminescence quantum yield (PLQY) and are subliming without any decomposition. The fundamental concept revolves around a right combination of specific anions and ligands and allows for tuning the emitter colour and energy levels to fit into relevant OLED hosts.
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