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Issue 9, 2011
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Highly efficient red fluorescent dyes for organic light-emitting diodes

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Abstract

Two red color luminescent dyes, 4-(dicyanomethylidene)-2-tert-butyl-6-(2-(1-(4-tert-butylphenyl)-1,2,3,4-tetrahydroquinolin-6-yl)vinyl)-4H-pyran (OJ1) and 4-(dicyanomethylidene)-2-tert-butyl-6-(2-(1-(4-tert-butylphenyl)-2,3-dihydro-2-methylindolin-5-yl)vinyl)-4H-pyran (OJ2), were synthesized readily in high yields and were used in the fabrication of organic light-emitting diodes (OLEDs). The physical properties of these materials are fully investigated in this report. Their structures are analogous to the well-known red dye, 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB), yet with better electrostability. A typical device made with OJ2 doped 1% in aluminium tris(8-hydroxyquinolinate) (Alq3) displayed a red light with a narrow bandwidth (fwhm 72 nm) at λmax 615 nm corresponding to a CIE coordinate (0.62, 0.38). The device can be turned on at 3.5 V, and reaches a luminance intensity of 43 400 cd m at ca. 20 V. It shows a luminance efficiency of 6.46 cd A−1, a power efficiency of 2.04 lm W−1, and an external quantum efficiency of 3.27%. The performances of devices are tunable either by adjusting the doping concentrations or by changing the device configurations.

Graphical abstract: Highly efficient red fluorescent dyes for organic light-emitting diodes

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Publication details

The article was received on 16 Sep 2010, accepted on 14 Dec 2010 and first published on 24 Jan 2011


Article type: Paper
DOI: 10.1039/C0JM03109G
J. Mater. Chem., 2011,21, 3091-3099

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    Highly efficient red fluorescent dyes for organic light-emitting diodes

    Y. J. Chang and T. J. Chow, J. Mater. Chem., 2011, 21, 3091
    DOI: 10.1039/C0JM03109G

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