Synthesis and electroluminescence property of new type emitting materials including diazocine for OLEDs

ABSTRACT

Four emitting compounds, namely, 2,8-Bis-(10-phenanthren-9-yl-anthracen-9-yl)-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-4), 2,8-Bis-(10-pyren-1-yl-anthracen-9-yl)-6H,12H-5, 11-methano-dibenzo[b,f][1,5]diazocine(AK-5), 2-[10-(9,9-Dimethyl-9,9a-dihydro-4aH-fluoren-2-yl)-anthracen-9-yl]-8-[10-(9,9-dimethyl-9H-fluoren-2-yl)-anthracen-9-yl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-6) and 2,8-Bis-[10-(spiro-fluroene)-anthracen-9-yl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-7) were synthesized through Suzuki-coupling reaction. Physical properties such as optical, electroluminescent properties were investigated. UV-Visible spectrum of AK-4, AK-5, AK-6 and AK-7 in film state showed maximum 372, 374, 372 and 373 nm. PL spectrum of AK-4, AK-5, AK-6 and AK-7 showed maximum emission wavelength of 437, 451, 445 and 493 nm. Four compounds were used as EML in OLED device: ITO/2-TNATA(60 nm)/NPB(15 nm)/EML(35 nm)/Alq₃(20 nm)/LiF(1 nm)/Al(200 nm). AK-6 OLED device showed C.I.E. value of (0.16, 0.20) and luminance efficiency of 2.67 cd/A.

KEYWORDS:

• Diazocine
• emitting materials
• fluorescence
• OLEDs

Funding

This research was supported by a grant from the Core Technology Development Program for the Commercialization of Functional Chemicals funded by the Ministry of Trade, Industry and Energy, Republic of Korea (Project No. 10060523). This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (No. 2016R1D1A1B03931477). This work was also supported by the Technological Innovation R & D Program funded by SMBA (S2359547), Korea and National R&D Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science & ICT (No. 2017M3A7B4041699).