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Fluorene‐Based Single‐Chain Copolymers for Color‐Stable White Light‐Emitting Diodes
Author(s) -
Sun Mingliang,
Niu Qiaoli,
Du Bin,
Peng Junbiao,
Yang Wei,
Cao Yong
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700016
Subject(s) - fluorene , copolymer , electroluminescence , chromophore , materials science , photochemistry , white light , common emitter , diode , quantum efficiency , oled , polymer chemistry , optoelectronics , chemistry , polymer , nanotechnology , composite material , layer (electronics)
Fluorene‐based single‐chain copolymers with a white light emitter consisting of a blue and an orange chromophore have been synthesized and their photophysical and electroluminescent properties are investigated. The experimental results suggest that only a relatively small fraction of the orange‐emitting units incorporated into the fluorene is needed to achieve efficient white light emission by controlled incomplete energy transfer. A device from a copolymer with 0.02% DDQ content showed the highest external quantum efficiency of 2.64% with a luminance efficiency of 4.06 cd · A −1 with CIE coordinates (0.28, 0.24). The EL emissions are extremely stable over a wide range of current densities.