biostudies-literatureFang PNatural Science Foundation of Beijing Municipality (Beijing Natural Science Foundation)Natural Science Foundation of Beijing MunicipalityNational Natural Science Foundation of ChinaNational Natural Science Foundation of China (National Science Foundation of China)170https://www.ebi.ac.uk/biostudies/studies/S-EPMC10328933biostudies-literatureUnknown12(1)White organic light-emitting diodes (WOLEDs) is a new generation of lighting technology and has stimulated wide-ranging studies. Despite the advantage of simple device structure, single-emitting-layer WOLEDs (SEL-WOLEDs) still face the challenges of difficult material screening and fine energy level regulation. Herein, we report efficient SEL-WOLEDs with a sky-blue emitting cerium(III) complex Ce-TBO^2Et and an orange-red emitting europium(II) complex Eu(Tp^2Et)₂ as the emitters, showing a maximum external quantum efficiency of 15.9% and Commission Internationale de l'Eclairage coordinates of (0.33, 0.39) at various luminances. Most importantly, the electroluminescence mechanism of direct hole capture and hindered energy transfer between the two emitters faciLight, science & applicationsLanthanide complexes with d-f transition: new emitters for single-emitting-layer white organic light-emitting diodes.PMC10328933220201522071003, 62104013, and 92156016Liu ZHuang YFang PYu GBian ZZhao ZHuo PWang LfalseLanthanide complexes with d-f transition: new emitters for single-emitting-layer white organic light-emitting diodes.White organic light-emitting diodes (WOLEDs) is a new generation of lighting technology and has stimulated wide-ranging studies. Despite the advantage of simple device structure, single-emitting-layer WOLEDs (SEL-WOLEDs) still face the challenges of difficult material screening and fine energy level regulation. Herein, we report efficient SEL-WOLEDs with a sky-blue emitting cerium(III) complex Ce-TBO^2Et and an orange-red emitting europium(II) complex Eu(Tp^2Et)₂ as the emitters, showing a maximum external quantum efficiency of 15.9% and Commission Internationale de l'Eclairage coordinates of (0.33, 0.39) at various luminances. Most importantly, the electroluminescence mechanism of direct hole capture and hindered energy transfer between the two emitters faci2023-01-01T00:00:00Z2023 Jul2025-04-20T03:45:07.873Z2025-04-20T03:45:07.873ZS-EPMC103289333741988010.1038/s41377-023-01211-5