Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 36, Pages 30022-30028Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b09013
Keywords
OLED; fluorescence; blue emitter; device lifetime; external quantum efficiency
Funding
- National R&D Program through the National Research Foundation of Korea (NRF) - Ministry of Science ICT [2017M3A7B4041699]
- Industrial Strategic Technology Development Program - Ministry Economy (MKE, Korea) [10042590]
- Technology Development Program for Strategic Core Materials - Ministry of Trade, Industry & Energy, Republic of Korea [10047758]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10042590] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2017M3A7B4041699] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, four emitters of blue light are synthesized by selecting pyrene with its high photoluminescence quantum yield (PLQY) as the core group and variants of the electron-donating diphenylamine (DPA) as side groups. The four compounds have different numbers, sizes, and substitution positions of alkyl groups on the DPA. Each of the four compounds when doped in OLED devices shows a high current efficiency (CE) of over 7 cd A(-1) and a high external quantum efficiency (EQE) of over 7.5%. In addition, the compounds yield electroluminescence (EL) spectra showing peaks with narrow full width at half-maximum (fwhm) values of 37-40 nm and hence indicative of high color purity. Moreover, one compound N1,N6-bis(5-(tert-buty1)-2-methylpheny1)-N1,N6-bis(2,4-dimethylphenyl)-pyrene-1,6-diamine (3Me-1Bu-TPPDA), shows a very high EQE of 9.25% and a very long lifetime with an LT95 of 471 h.
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