Blue light emission of new anthracene derivatives produced using optimized side group link positions. (September 2018)

• Record Type: Journal Article
• Authors: Kang, Seokwoo; Jung, Hyocheol; Lee, Hayoon; Lee, Suji; Jung, Mina; Lee, Jaehyun; Chul Kim, Young; Park, Jongwook
• Is Part Of: Dyes and pigments. Volume 156(2018)
• Page Start: 369
• Page End: 378
• Publication Date: 2018-09
• Subjects: Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.04.029
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Using an anthracene chromophore as a core group and a phenyl carbazole chromophore as a side group, three new emitters of blue light, 2-DCPA, 3-DCPA and 4-DCPA, were synthesized. The three compounds differed with regard to the position of the carbazole linked to the core, with 2-DCPA and 4-DCPA using carbazole nodes and 3-DCPA using the lobe position. Density functional theory calculations were performed to determine which positions of the carbazole moiety had node characteristics and which had lobe characteristics. The PLmax values of 2-DCPA, 3-DCPA and 4-DCPA in the film state were in the blue region, at 453, 457, and 452 nm, respectively. Of these materials, 3-DCPA, i.e., that with the linkage to the lobe position, showed the highest efficiency, with a value of 2.91 cd/A, and EQE, with a value of 2.65%. In a doped device using CBP as a host material and 3-DCPA as a dopant, the ELmax emission was observed to be in the deep blue region, at 433 nm, and with a CIE value of (0.150, 0.068). Highlights: A new blue emitter was synthesized by linking different positions of a carbazole to the anthracene. The PLmax values of 2-DCPA, 3-DCPA and 4-DCPA in the film state were in the blue region, at 453, 457, and 452 nm. 3-DCPA achieved deep blue EL performance of CIE (x, y) value of (0.150, 0.068), 1.61 cd/A, and EQE of 2.74%.