Solution-Processed White Light-Emitting Diode Utilizing Hybrid Polymer and Red–Green–Blue Quantum Dots

A hybrid polymer-quantum dots (QDs) white light-emitting diode (WLEDs) device with a multi-layer structure by all solution processing is simply fabricated by using a spin coating technique. From transmission electron microscopy (TEM) study, red–green–blue (RGB) CdSe/ZnS QDs are mainly distributed along with the circumference of poly(N-vinylcarbazole) (PVK) surfaces, resulting in core–shell hybrid polymer-QDs of [RGB CdSe/ZnS QDs]/PVK. The Al/Cs2CO3/[RGB CdSe/ZnS QDs+PVK]/poly[(N,N '-bis(4-butylphenyl)-N,N '-bis(phenyl)benzidine)] (poly-TPD)/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/indium–tin-oxide (ITO)/glass WLEDs shows electroluminescence (EL) centered at around 474, 544, and 629 nm with CIE coordinates, (0.44,0.32) at the forward bias +11 V, which clearly reveals that CdSe/ZnS QDs existing at the interface between PVK plays as a recombination center of exciton.

[1]  K. Char,et al.  Highly Efficient Green‐Light‐Emitting Diodes Based on CdSe@ZnS Quantum Dots with a Chemical‐Composition Gradient , 2009 .

[2]  Michael Check,et al.  Highly efficient quantum-dot light-emitting diodes with DNA-CTMA as a combined hole-transporting and electron-blocking layer. , 2009, ACS nano.

[3]  G. Gigli,et al.  White electroluminescence from a microcontact-printing-deposited CdSe/ZnS colloidal quantum-dot monolayer. , 2008, Small.

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

[5]  Tae Whan Kim,et al.  Nonvolatile flexible organic bistable devices fabricated utilizing CdSe/ZnS nanoparticles embedded in a conducting poly N-vinylcarbazole polymer layer , 2008, Nanotechnology.

[6]  Yongfang Li,et al.  Bright, multicoloured light-emitting diodes based on quantum dots , 2007 .

[7]  Andrew Y. Wang,et al.  Bright and color-saturated emission from blue light-emitting diodes based on solution-processed colloidal nanocrystal quantum dots. , 2007 .

[8]  Yang Yang,et al.  Low‐Work‐Function Surface Formed by Solution‐Processed and Thermally Deposited Nanoscale Layers of Cesium Carbonate , 2007 .

[9]  V. Bulović,et al.  Electroluminescence from a mixed red-green-blue colloidal quantum dot monolayer. , 2007, Nano letters.

[10]  Tae Whan Kim,et al.  Memory effect of CdSe∕ZnS nanoparticles embedded in a conducting poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene] polymer layer , 2007 .

[11]  G. Gigli,et al.  Bright White‐Light‐Emitting Device from Ternary Nanocrystal Composites , 2006 .

[12]  Tae Whan Kim,et al.  Nonvolatile memory cell effect in multilayered Ni1−xFex self-assembled nanoparticle arrays in polyimide , 2006 .

[13]  L. Wang,et al.  Novel approach to tuning the physical properties of organic-inorganic hybrid semiconductors. , 2006, Physical review letters.

[14]  Gang Li,et al.  Achieving High‐Efficiency Polymer White‐Light‐Emitting Devices , 2006 .

[15]  Darryl L. Smith,et al.  Energy-transfer pumping of semiconductor nanocrystals using an epitaxial quantum well , 2004, Nature.

[16]  Jacob M. Taylor,et al.  Tunable Nonlocal Spin Control in a Coupled-Quantum Dot System , 2004, Science.

[17]  D. Gammon,et al.  An All-Optical Quantum Gate in a Semiconductor Quantum Dot , 2003, Science.

[18]  V. Bulović,et al.  Electroluminescence from single monolayers of nanocrystals in molecular organic devices , 2002, Nature.

[19]  Yang Yang,et al.  Degradation mechanism of phosphorescent-dye-doped polymer light-emitting diodes , 2001 .

[20]  K. Karrai,et al.  Optical emission from a charge-tunable quantum ring , 2000, Nature.

[21]  M. Bawendi,et al.  Electroluminescence from heterostructures of poly(phenylene vinylene) and inorganic CdSe nanocrystals , 1998 .

[22]  C. H. Chen,et al.  Electroluminescence of doped organic thin films , 1989 .