Heavy Atom Effect of Selenium for Metal-Free Phosphorescent Light-Emitting Diodes
Source abstract
Abstract
Room-temperature phosphorescence from metal-free purely organic molecules has recently gained much interest. We devised metal-free organic phosphors by incorporating selenium (Se) to promote spin–orbit coupling by its nonmetal heavy atom effect. The Se-based organic phosphors showed bright phosphorescent emission in organic light-emitting diodes (OLEDs) and photo-excited phosphorescence in an amorphous film state. Large orbital angular momentum change (ΔL) during the electron transition process and heavy atom effect of Se render a PL quantum yield of 0.33 ± 0.01 and a high external quantum efficiency (EQE) of 10.7 ± 0.14% in phosphorescent LEDs. This work demonstrates the rational molecular design of metal-free organic phosphorescent emitters with Se as an alternative novel class of materials to the conventional organometallic phosphors for OLEDs.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
Funding
National Research Foundation of Korea · Division of Materials Research
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