Enhanced luminance of white organic light-emitting diode with yellow nanophosphors-embedded blue polymer emitting layer |
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| Authors: | JH Park NW Jang |
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| Institution: | a Department of Image System Science and Engineering, Pukyong National University, Busan 608-739, Republic of Korea
b Division of Electrical and Electronics Engineering, Korea Maritime University, Busan 606-791, Republic of Korea |
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| Abstract: | White organic light-emitting device was achieved through an incorporation of yellow YAG nanophosphors into blue polyfluorene emitting layer: electrode/YAG@polyfluorene/hole-transport/injection layers/ITO glass. The brightness of the proposed device (230 cd/m2 at 30 V) was enhanced by a factor of about two in comparison with that of phosphor-free reference device. It is attributed to the increased local electric field caused by bumps of nanophophors on the emitting layer. With increase of voltage, the blue-green emission decreased whereas the yellow emission increased. It is due to the effective energy transfer from the blue-green to the yellow bands. |
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| Keywords: | White organic light-emitting device Phosphors Polyfluorene Luminescence |
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