Abstract
A novel blue light emitter, zinc(II) [2-(2-hydroxyphenyl)benzoxazole] [Zn(HPB)2], has been synthesized and evaluated in organic light-emitting diodes (OLED). Hereby, an OLED with a white light emission and a high color stability using Zn(HPB)2 and a layer of tris(8-quinolinolato) aluminum (Alq3) doped with 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) (Alq3:DCJTB) as emitters has been demonstrated. The structure of this OLED is indium–tin-oxide (ITO)/N,N'-bis-(1-naphthl)-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB; 40 nm)/Zn(HPB)2 (40 nm)/Alq3:DCJTB (40 nm)/LiF/Al. The Commission Internationale de l'Eclairage (CIE) coordinates of the white emission are (0.32, 0.33) at an applied voltage of 14 V. The photoluminescence (PL) and electroluminescence (EL) spectra of Zn(HPB)2 showed emission peaks at a wavelength of 455 nm.
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