Deep blue highly efficient intra-metallic emitters

beeOLED, a German start-up, pioneers a solution to the well-known issue of short blue emitter lifetimes in OLED. Leveraging divalent Europium and its unique intra-metallic transition, beeOLED introduces a groundbreaking approach. Eu(II) features parity-allowed d-f transitions with a ~1 µs lifetime, comparable to widely-used phosphorescent emitters. With 100% internal quantum efficiency and a tunable deep-blue emission spectrum, beeOLED's Eu(II) complexes promise enhanced stability and longevity in OLEDs. By circumventing organic bond cleavage through single intra-metallic atom excitation, beeOLED overcomes typical issues encountered with organic blue emitters. Through rational ligand design, challenges of Eu(II) complex oxidation and sublimation are resolved. beeOLED is spearheading a new wave of robust and versatile blue OLED devices.