期刊
CHEMISTRY OF MATERIALS
卷 32, 期 6, 页码 2583-2592出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c00078
关键词
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资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [2016R1A2B3008845, 2016H1A2A1910187]
- National Science Foundation [DMREF DMR 1435965]
- National Research Foundation of Korea [2016H1A2A1910187] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 (Delta L) 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.
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