Synthesis and electroluminescent properties of bis(3- N-ethylcarbazolyl)cyanoterephthalidene

• Published in: Thin solid films Vol. 363; no. 1; pp. 90 - 93
• Main Authors: Park, Jong-Wook, Lee, Ji-Hoon, Lee, Ho-Sik, Kang, Dou-Yol, Kim, Tae-Wan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2000
• Subjects: Bis(3- N-ethylcarbazolyl)cyanoterephthalidene (BECCP); Blue emitting material; Electroluminescence; Poly(3,6- N-2-ethylhexylcarbazolyl cyanotere-phthalidene (PECCP); Blue emitting material; Electroluminescence; Bis(3- N-ethylcarbazolyl)cyanoterephthalidene (BECCP); Poly(3,6- N-2-ethylhexylcarbazolyl cyanotere-phthalidene (PECCP)
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/S0040-6090(99)01008-1

A new blue electroluminescent material analog to poly(3,6- N-2-ethylhexylcarbazolyl cyanotere-phthalidene) (PECCP) was synthesized by a facile reaction of 9-ethyl–3-carbazole carboxy aldehyde with 1,4-phenylenediacetonitrile. The resulting bis(3- N-ethylcarbazolyl)cyanoterephthalidene (BECCP) having cyano (electron acceptor part) and carbazole moiety (electron donor part) was characterized by NMR, IR, UV and was vacuum-deposited into thin film of smooth surface. BECCP shows blue PL and EL spectra at 480 nm corresponding to 2.58 eV and typical rectifying diode characteristics in ITO/BECCP/Al devices in both forward and reverse bias. The turn on voltage are +8 V and 4 V when the BECCP layer are 600 and 300 Å thick, respectively.