Characteristics of organic light-emitting devices consisting of dye-doped spin crossover complex films

THIN SOLID FILMS

卷:531

Article

Matsuda, Masaki¹  Kiyoshima, Keita¹  Uchida, Ryoma¹  Kinoshita, Nobuaki¹  Tajima, Hiroyuki² 

[1] Kumamoto Univ, Grad Sch Sci & Technol, Chuo Ku, Kumamoto 8608555, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

关键词: Organic light-emitting devices;    Electroluminescence;    Electroluminecence switching;    Spin crossover complex;    Spin transition;    Chlorophyll a;   

DOI  :  10.1016/j.tsf.2013.01.094

来源: Elsevier

【 摘 要 】

Two organic light-emitting devices (OLEDs) were fabricated to investigate the mechanism of electroluminescence (EL) switching accompanying the spin transition of [Fe(dpp)(2)](BF4)(2) (dpp=2,6-di(pyrazol-1-yl)pyridine) observed in an OLED with the structure indium tin oxide (ITO)/[Fe(dpp)(2)](BF4)(2):chlorophyll a/Al, consisting of a chlorophyll a (Chl a)-doped [Fe(dpp)(2)](BF4)(2) film. One OLED consisted of poly(N-vinylcarbazole) (PVK) between an ITO electrode and the active layer, and the other contained the electron transporting dye Nile Red (NR) as an emitting dopant material instead of the hole transporting Chl a. In both devices ITO/PVK/[Fe(dpp)(2)](BF4)(2):Chl a/Al and ITO/[Fe(dpp)(2)](BF4)(2):NR/Al, EL emission from the dye compound was observed, irrespective of the spin state of [Fe(dpp)(2)](BF4)(2). It was determined that the EL switching accompanying the spin transition was dominated by a change in the molecular orbital level concerning electron transport in [Fe(dpp)(2)](BF4)(2). (C) 2013 Elsevier B. V. All rights reserved.

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