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Quantum-dot blue light emitting diodes utilizing organic/inorganic hybrid structures

Author:
Wu, Feifei  Hu, Lian  Zhang, Bingpo  Li, Ruifeng  Wu, Huizhen  


Journal:
JAPANESE JOURNAL OF APPLIED PHYSICS


Issue Date:
2015


Abstract(summary):

We report blue color quantum-dot light-emitting diodes (QDLEDs) using an organic inorganic hybrid structure and CdZnS ZnS core shell quantum-dot emitters. In the device organic ploy(3,4-ethylenedioxythiophene):ploy(styrene sulfonate) (PEDOT:PSS) and NN'-bis(3-methylphenyl)-NN'-bis(pheny1)-99-spiro-bifluorene (TPD) thin films are respectively used as the hole-injection layer (HIL) and the hole-transporting layer (HTL), and an inorganic ZnSnO thin film is used as the electron-transporting layer (ETL). In the blue QDLEDs, the function of the TPD-HTL is explored and it is found that the device employing a TPD-HTL exhibits much better optical characteristics compared with that having an identical device layout but without the TPD-HTL. The TPD HTL acts as a transition layer and offers a ladder for the injected holes from PEDOT:PSS to the QDs, leading to an more efficient hole injection. It is further found that the intensity ratio between surface-state emission (SSE) and band-edge emission (BEE) (Rs/B) of the two devices shows significant difference at high bias voltages. The SSE becomes more prominent at higher bias voltage in the QDLEDs due to the imbalance injection of holes and electrons. The injected holes firstly encounter the excessive electrons accumulated at the surface of the charged QDs, thus the probability of hole electron recombination at the QDs surface is greatly enhanced at high bias voltages. (C) 2015 The Japan Society of Applied Physics


Page:
BCO23---BCO23


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