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Pure‐Red Dye for Organic Electroluminescent Devices: Bis‐Condensed DCM Derivatives
Author(s) -
Jung B.J.,
Yoon C.B.,
Shim H.K.,
Do L.M.,
Zyung T.
Publication year - 2001
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/1616-3028(200112)11:6<430::aid-adfm430>3.0.co;2-g
Subject(s) - oled , materials science , electroluminescence , pyran , diamine , biphenyl , indium tin oxide , photochemistry , polymer chemistry , medicinal chemistry , organic chemistry , nanotechnology , chemistry , layer (electronics)
In this paper, the bis‐condensed 4‐(dicyanomethylene)‐2‐methyl‐6‐[ p ‐(dimethylamino)styryl]‐4 H ‐pyran ( DCM) derivatives are introduced as a new class of red dye for organic light‐emitting devices (OLEDs). They showed more red‐shifted emission than the mono‐substituted DCM derivatives and the emission maxima increased as the electron‐donating ability of the aromatic donor group increased. On the basis of these results, red light‐emitting devices were fabricated with bis‐condensed DCM derivatives as red dopants. For a device of configuration ITO/TPD/Alq 3 + DADB (5.2 wt.‐%)/Alq 3 /Al (where ITO is indium tin oxide, TPD is N , N ′‐diphenyl‐ N , N ′‐bis(3‐methylphenyl)‐1,1′‐biphenyl‐4,4′‐diamine, Alq 3 is tris(8‐hydroxyquinoline) aluminum, and DADB is [2,6‐bis[2‐[5‐(dibutylamino)phenyl]vinyl]‐4H‐pyran‐4‐ylidene]propanedinitrile), pure red emission was observed with Commission Internationale de l’Eclairage (CIE 1931) coordinates of (0.658, 0.337) at 25 mA/cm 2 .