Improved red dopants for organic electroluminescent devices | Zendy

Chen C. H. | Zendy; Tang C. W. | Zendy; Shi J. | Zendy; Klubek K. P. | Zendy

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Improved red dopants for organic electroluminescent devices

Author(s) -

Chen C. H.,

Tang C. W.,

Shi J.,

Klubek K. P.

Publication year - 1998

Publication title -

macromolecular symposia

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.257

H-Index - 76

eISSN - 1521-3900

pISSN - 1022-1360

DOI - 10.1002/masy.19981250103

Subject(s) - electroluminescence , dopant , fluorescence , materials science , quenching (fluorescence) , photochemistry , doping , photoluminescence , chromaticity , pyran , oled , luminescence , optoelectronics , chemistry , organic chemistry , nanotechnology , optics , physics , layer (electronics)

A t ‐butyl substituted red fluorescent dye, 4‐(dicyanomethylene)‐2‐ t‐butyl ‐6‐(1,1,7,7‐tetramethyljulolidyl‐9‐enyl)‐4 H ‐pyran (DCJTB), has been found to be an excellent dopant in AIQ 3 which produces a highly efficient organic EL device with improved red chromaticity. Unlike 4‐(dicyanomethylene)‐2‐ methyl ‐6‐(1,1,7,7‐tetramethyljulolidyl‐9‐enyl)‐4 H ‐pyran (DCJT), DCJTB can be synthesized in a pure form directly from the unsymmetrical 4‐(dicyanomethylene)‐2‐( t ‐butyl)‐6‐methyl‐4 H ‐pyran without the contamination of the non‐fluorescent bis ‐condensation byproduct which is prevalent in the DCJT preparation. Both photoluminescence and electroluminescence in the solid films of DCJTB in AlQ 3 are modestly enhanced by the extra t‐butyl substitution as a result of a reduction in the effect of concentration quenching. The operation stability of the DCJTB doped EL device is superior, having a half‐life of over 5,000 h driven at an initial brightness > 400 cd/m 2 .

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