am9b20181_si_001.pdf (1.4 MB)
Organic Light-Emitting Diode Employing Metal-Free Organic Phosphor
journal contribution
posted on 2020-01-19, 13:29 authored by Byeongseop Song, Wenhao Shao, Jaehun Jung, Seong-Jun Yoon, Jinsang KimMetal-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/m2 at 100 mA/cm2) was realized with 2.5% maximum external
quantum efficiency at 1 mA/cm2.
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polymer hostsphosphorOLED devicesmAOrganic Light-Emitting Diode Employing Metal-Free Organic Phosphor Metal-freedevice fabrication processesorganometallic counterpartstailor-designed novel fluorene-basedmaterial propertieschemical stabilityspiro-annulated phenyl moietiescolor puritylight-emitting diodesquantum efficiencyPhotoluminescence quantumdevice physicsdesign windowexciplex emissionOLED host materials
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