Anthracene derivatives as efficient emitting hosts for blue organic light-emitting diodes utilizing triplet–triplet annihilation

• Published in: Organic electronics Vol. 13; no. 7; pp. 1197 - 1203
• Main Authors: Fukagawa, Hirohiko, Shimizu, Takahisa, Ohbe, Noriyuki, Tokito, Shizuo, Tokumaru, Katsumi, Fujikake, Hideo
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2012; Elsevier
• Subjects: Anthracene; Applied sciences; Blue organic light-emitting diode; Electronics; Exact sciences and technology; Molecular electronics, nanoelectronics; Optoelectronic devices; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Triplet–triplet annihilation; Triplet–triplet annihilation; Anthracene; Blue organic light-emitting diode; Performance evaluation; Upconversion; Molecular structure; Triplet-triplet annihilation; Electroluminescence; Quantum yield; Anthracene derivatives; Triplet state; Molecular electronics; High efficiency; Optoelectronic device; Organic light emitting diodes; Blue light; Organic electronics; Excited state
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2012.03.019

[Display omitted] ► Molecular design strategies for the host materials suitable for efficient, blue fluorescent OLEDs. ► External quantum efficiency of over 7% in blue fluorescent OLEDs. ► Effect of excimer formation of host material on the efficiency of OLEDs. The molecular design strategies for the host materials suitable for highly efficient, blue fluorescent organic light-emitting diodes (OLEDs) are demonstrated. The device characteristics of blue fluorescent OLEDs are compared with different host materials. Some devices exhibit a highly efficient blue electroluminescence with a high external quantum efficiency of more than 7%. The correlation between OLED efficiency and triplet–triplet annihilation is characterized by measuring the up-conversion of triplet excited states into singlet ones. The host materials require an anthracene unit and a bulky molecular structure to prevent the overlap of anthracene units between adjacent molecules in the film.