Abstract
A blue fluorescent organic compound, 1-phenyl-3,4-
dimethyl-1H-pyrazolo[3,4-b]quinoline (PAQ5), is a suitable emitter to enable a color
stable blue emission from multilayered light emitting devices. The dopant PAQ5
functioned as an energy trap and an emitter having its HOMO/LUMO levels lying inside the
band gap of the host to secure an efficient energy transfer; it also reduced barrier
height for electron injection and improved electron transporting of the emitting layer.
It lowered the turn-on electric field and enhanced luminance gradually as the dopant
concentrations increased. A bright and color stable blue emission having CIE (x,y) =
(0.168, 0.100) was obtained. Field-dependent color change of such multilayered devices
within a wide range of driving electric fields was suppressed by PAQ5 dopant. A color
purity of 0.815 was achieved.
© 2011 IEEE
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