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1.1 Small molecule organic light emitting-diodes (OLEDs)
Electroluminescence is a phenomenon converting electrical energy into light
that has been seen in a wide range of inorganic semiconductors, and for
organic semiconductors was first reported for anthracene single crystals in
the 1960s [4] The early attempts to make organic electroluminescent device
suffered several problems such as high turn-on voltage, poor stability, and
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