Improvement of color purity in white OLED based on Zn(HPB) 2 as blue emitting layer

We synthesized zinc (II) [2-(2-hydroxyphenyl)benzoxazole] (Zn(HPB) 2) as blue emitting materials and evaluated in the organic light emitting diodes (OLEDs). The layer of Zn(HPB) 2 doped with 4-(dicyanomethylene)-2- t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) (Zn(HPB) 2:DCJTB) as...

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Bibliographic Details
Published in:Thin solid films 2008-04, Vol.516 (11), p.3637-3640
Main Authors: Kim, Dong-Eun, Kim, Won-Sam, Kim, Byoung-Sang, Lee, Burm-Jong, Kwon, Young-Soo
Format: Article
Language:English
Subjects:
Applied sciences
Blue emitting layer
CIE
Electronics
Exact sciences and technology
Materials
Optoelectronic devices
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
White OLED
Zn(HPB) 2
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Summary:We synthesized zinc (II) [2-(2-hydroxyphenyl)benzoxazole] (Zn(HPB) 2) as blue emitting materials and evaluated in the organic light emitting diodes (OLEDs). The layer of Zn(HPB) 2 doped with 4-(dicyanomethylene)-2- t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) (Zn(HPB) 2:DCJTB) as emitters has been demonstrated. The structure of the device is indium–tin–oxide (ITO)/ N,N′-bis-(1-naphthl)-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB, 40 nm)/Zn(HPB) 2/Zn(HPB) 2:DCJTB/Alq 3 (20 nm)/LiF/Al. The thickness of Zn(HPB) 2 layer was 0, 10, 20, 30 nm at the same time the thickness of Zn(HPB) 2:DCJTB layer were 40, 30, 20, 10 nm. When thickness of Zn(HPB) 2 layer was 30 nm and the thickness of Zn(HPB) 2:DCJTB layer was 10 nm, white emission is achieved. The Commission Internationale de l'Eclairage (CIE) coordinates of the white emission are (0.304, 0.332) at an applied voltage of 10.5 V.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2007.08.103