Red Fluorescent Donor-pi-Acceptor Type Materials based on Chromene Moiety for Organic Light-Emitting Diodes
- Authors
- Yoon, Jhin-yeong; Lee, Jeong Seob; Yoon, Seung Soo; Kim, Young Kwan
- Issue Date
- 20-Jun-2014
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Red fluorescence; Donor-pi-Acceptor; Chromene derivatives; OLED
- Citation
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.35, no.6, pp.1670 - 1674
- Journal Title
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY
- Volume
- 35
- Number
- 6
- Start Page
- 1670
- End Page
- 1674
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16676
- DOI
- 10.5012/bkcs.2014.35.6.1670
- ISSN
- 0253-2964
- Abstract
- Two red emitters, 2-(7-(4-(diphenylamino)styryl)-2-methyl-4H-chromen-4-ylidene)malonitrile (Red 1) and 2-(7-(julolidylvinyl)-2-methyl-4H-chromen-4-ylidene)malonitrile (Red 2) have been designed and synthesized for application as red-light emitters in organic light emitting diodes (OLEDs). In these red emitters, the julolidine and triphenyl moieties were introduced to the emitting core as electron donors, and the chrome-7 derived electron accepting groups such as 2-methyl-(4H-chromen-4-ylidene)malononitrile were connected to electron donating moieties by vinyl groups. To explore the electroluminescence properties of these materials, multilayered OLEDs using red materials (Red 1 and Red 2) as dopants in Alq(3) host were fabricated. In particular, a device using Red 1 as the dopant material showed maximum luminous efficiencies and power efficiencies of 0.82 cd/A and 0.33 lm/W at 20 mA/cm(2). Also, a device using Red 2 as a dopant material presented the CIEx,y coordinates of (0.67, 0.32) at 7.0 V.
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