期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 5, 页码 6137-6143出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20181
关键词
room-temperature phosphorescence; heavy atom; light-emitting diode; spin-orbit coupling; orbital angular momentum; El-Sayed rule; fluorene
资金
- National Science Foundation [DMREF DMR 1435965]
- Qatar National Research Fund [NPRP8-245-1-059]
- Samsung Global Research Outreach
Metal-free organic phosphorescent materials are promising alternatives to the organometallic counterparts predominantly adopted in organic light-emitting diodes due to their low cost, chemical stability, and large molecular design window. However, only a few reports on OLED devices incorporating metal-free organic phosphors have been presented due to the lack of understanding on material properties, device physics, and device fabrication processes. Here, we report a tailor-designed novel fluorene-based organic phosphor with efficient spin orbit coupling activated by bromine, aromatic carbonyl, and spiro-annulated phenyl moieties. Photoluminescence quantum yield of 24.0% was achieved when doped in optically inert amorphous polymer hosts. Effects of OLED host materials on the phosphor were investigated in terms of color purity, suppression of exciplex emission, and restraint of molecular motion. Bright green phosphorescence emission (1430 cd/m(2) at 100 mA/cm(2)) was realized with 2.5% maximum external quantum efficiency at 1 mA/cm(2).
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