Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 12, Pages 14453-14459Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c02635
Keywords
pure violet; fluorescent emitter; narrow bandwidth; external quantum efficiency; photoluminescence quantum yield
Funding
- National Research Foundation of Korea [2020R1A2C2100872]
- National Research Foundation of Korea [2020R1A2C2100872] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel violet emitter, m-FLDID, was designed and synthesized for use in pure violet organic light-emitting diodes. The meta-oriented bis-fusion of two DMID subunits in m-FLDID effectively improved the quantum yield and resulted in a narrow-band, pure violet emission. Devices doped with m-FLDID achieved an external quantum efficiency of > 5% and a narrow emission spectrum with a maximum at 407 nm.
A novel violet emitter, 1,3-bis[10,10-dimethyl-10H-indeno[2,1-b]]indolo[3,2,1-jk]indolo[1',2',3':1,7]indolo[3,2-b]carbazole (m-FLDID), was designed and synthesized by meta-oriented bis-fusion of two 7,7-dimethyl-5,7-dihydroindeno[2,1-b]carbazole (DMID) subunits for use in a pure violet organic light-emitting diode (OLED). Incorporation of the DMID subunits effectively reduced the nonradiative recombination rate, improving the photoluminescence quantum yield of the m-FLDID emitter. The meta-oriented bis-fusion of the two DMID subunits not only triggered an alternative distribution of the frontier orbitals but also effectively locked the p-conjugation chain, which ultimately resulted in a narrow-band, pure violet emission of the m-FLDID emitter. Doped m-FLDID devices possessed an external quantum efficiency (EQE) of > 5%, pure violet emission with a maximum at 407 nm, a narrow full width at half-maximum of 17 nm, and a Commission Internationale de leclairage y coordinate of less than 0.03. This is the first work reporting an EQE of > 5% and an extremely narrow emission spectrum for a pure violet emitter.
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