NiO as hole transport layers for all-inorganic quantum dot LEDs

Quantum dot light-emitting diodes (QD-LEDs) have recently attracted much attention due to its highly saturated emission color and the capability of tuning the emission color by means of engineering its size. In this letter, an allinorganic light-emitting diode based on colloidal core/shell CdS/ZnS nanocrystal quantum dots (QDs) emissive layer sandwiched between p-type NiO and n-type ZnO is reported. NiO and ZnO layers are deposited by means of the lowcost spin coating technique. The device showed a rectification behavior and QD light emission with the electroluminescent emissions at 605nm.

[1]  J. D. Desai,et al.  Spray pyrolytic synthesis of large area NiO x thin films from aqueous nickel acetate solutions , 2006 .

[2]  C. Lieber,et al.  Nanowire Nanosensors for Highly Sensitive and Selective Detection of Biological and Chemical Species , 2001, Science.

[3]  Donal D. C. Bradley,et al.  A Multilayered Polymer Light‐Emitting Diode Using a Nanocrystalline Metal‐Oxide Film as a Charge‐Injection Electrode , 2007 .

[4]  Vladimir Lesnyak,et al.  Layer‐by‐Layer All‐Inorganic Quantum‐Dot‐Based LEDs: A Simple Procedure with Robust Performance , 2010 .

[5]  Douglas J. Taylor,et al.  Sol–gel derived, nanostructured oxide lubricant coatings , 1999 .

[6]  Qi Zhang,et al.  Nickel oxide sol-gel films from nickel diacetate for electrochromic applications , 2003 .

[7]  Katsuyuki Morii,et al.  Encapsulation-free hybrid organic-inorganic light-emitting diodes , 2006 .

[8]  G. J. Wilson,et al.  All-inorganic quantum-dot light-emitting devices formed via low-cost, wet-chemical processing , 2010 .

[9]  K. Ogura,et al.  Semiconductor and electrochromic properties of electrochemically deposited nickel oxide films , 2004 .

[10]  Elsayed K. Elmaghraby,et al.  Characterization of nickel oxide films deposited at different substrate temperatures using spray pyrolysis , 2004 .

[11]  Jerzy Kanicki,et al.  Thin-Film Encapsulation of Organic Light-Emitting Devices , 2007 .

[12]  Satoshi Kobayashi,et al.  Ultraviolet electroluminescence from colloidal ZnO quantum dots in an all-inorganic multilayer light-emitting device , 2012 .

[13]  M. Bawendi,et al.  Colloidal quantum--dot light-emitting diodes with metal-oxide charge transport layers , 2008 .

[14]  Y. Sung,et al.  Surface morphological, microstructural, and electrochromic properties of short-range ordered and crystalline nickel oxide thin films , 2002 .

[15]  X. W. Sun,et al.  Color tunable light-emitting diodes based on p+-Si/p-CuAlO2/n-ZnO nanorod array heterojunctions , 2010 .

[16]  V. Bulović,et al.  NiO as an inorganic hole-transporting layer in quantum-dot light-emitting devices. , 2006, Nano letters.

[17]  A. Jiménez-González,et al.  Optical and electrical characteristics of aluminum-doped ZnO thin films prepared by solgel technique , 1998 .

[18]  Hao Yan,et al.  Layer-by-layer assembly of nanowires for three-dimensional, multifunctional electronics. , 2007, Nano letters.

[19]  J. Bernède,et al.  Properties of NiO thin films deposited by chemical spray pyrolysis using different precursor solutions , 2008 .

[20]  Jong-Wan Park,et al.  Reproducible resistive switching in nonstoichiometric nickel oxide films grown by rf reactive sputtering for resistive random access memory applications , 2005 .

[21]  S. Rhee,et al.  Chemical vapor deposition of nickel oxide films from Ni(C5H5)2/O2 , 2001 .