Cadmium-Doped Zinc Sulfide Shell as a Hole Injection Springboard for Red, Green, and Blue Quantum Dot Light-Emitting Diodes

Liu, Bochen1; Guo, Yue1; Su, Qiang2; Zhan, Yunfeng1; Chen, Zhao1; Li, Yang3,4; You, Baogui3,4; Dong, Xiaonan3; Chen, Shuming2; Wong, Wai-Yeung5,6,7

2022-03-01

10.1002/advs.202104488

ADVANCED SCIENCE   影响因子和分区

2198-3844

A new strategy is developed in which cadmium-doped zinc sulfide (CdZnS) is used as the outermost shell to synthesize red, green, and blue (RGB) quantum dots (QDs) with the core/shell structures of CdZnSe/ZnSe/ZnS/CdZnS, CdZnSe/ZnSe/ZnSeS/CdZnS, and CdZnSe/ZnSeS/ZnS/CdZnS, respectively. Firstly, the inner ZnS and ZnSe shells confine the excitons inside the cores of QDs and provide a better lattice matching with respect to the outermost shell, which ensures high photoluminescence quantum yields of QDs. Secondly, the CdZnS shell affords its QDs with shallow valence bands (VBs). Therefore, the CdZnS shell could be used as a springboard, which decreases the energy barrier for hole injection from polymers to QDs to be below 1.0 eV. It makes the holes to be easily injected into the QD EMLs and enables a balanced recombination of charge carriers in quantum dot light-emitting diodes (QLEDs). Thirdly, the RGB QLEDs made by these new QDs exhibit peak external quantum efficiencies (EQEs) of 20.2%, 19.2%, and 8.4%, respectively. In addition, the QLEDs exhibit unexpected luminance values at low applied voltages and therefore high power efficiencies. From these results, it is evident that CdZnS could act as an excellent shell and hole injection springboard to afford high performance QLEDs.

balanced charge carriers efficient quantum dot light-emitting diodes high photoluminescence quantum yields hole injection springboard outermost CdZnS shell

SCI ; EI

英语

通讯

National Natural Science Foundation of China[21901190,52073242] ; Key-Area Research and Development Program of Guangdong Province[2020B010174004] ; College Innovation Team Project of Guangdong Province[2021KCXTD042] ; Guangdong Basic and Applied Basic Research Foundation["2019A1515111201","2019A1515110778"] ; Science and Technology Planning Project of Guangdong Province[2020B0101030008] ; Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Project Program[2021ZZ201] ; Key Laboratory of Optoelectronic materials and Applications in Guangdong Higher Education[2017KSYS011] ; Hong Kong Research Grants Council[PolyU 153062/18P] ; Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices[2019B121205001] ; ITC Guangdong-Hong Kong Technology Cooperation Funding Scheme (TCFS)[GHP/038/19GD] ; Hong Kong Polytechnic University[1-ZE1C] ; Endowed Professorship in Energy from Miss Clarea Au[847S]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000763594000001

WILEY

20221011742628

Cadmium compounds ; Charge carriers ; Electron injection ; II-VI semiconductors ; Nanocrystals ; Organic light emitting diodes (OLED) ; Photoluminescence ; Quantum efficiency ; Quantum yield ; Selenium compounds ; Shells (structures) ; Zinc sulfide

Structural Members and Shapes:408.2 ; Electricity: Basic Concepts and Phenomena:701.1 ; Semiconducting Materials:712.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2 ; Quantum Theory; Quantum Mechanics:931.4 ; Crystalline Solids:933.1

Web of Science

1.Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Peoples R China
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
3.Poly Optoelect Tech Ltd, Jiangmen 529020, Peoples R China
4.Fujian Sci & Technol Innovat Lab Optoelect Inform, Fuzhou 350108, Peoples R China
5.Hong Kong Polytech Univ PolyU, Res Inst Smart Energy, Dept Appl Biol & Chem Technol, Hung Hom, Hong Kong, Peoples R China
6.Hong Kong Polytech Univ PolyU, Guangdong Hong Kong Macao Joint Lab Photon Therma, Hung Hom, Hong Kong, Peoples R China
7.PolyU Shenzhen Res Inst, Shenzhen 518057, Peoples R China

Liu, Bochen,Guo, Yue,Su, Qiang,et al. Cadmium-Doped Zinc Sulfide Shell as a Hole Injection Springboard for Red, Green, and Blue Quantum Dot Light-Emitting Diodes[J]. ADVANCED SCIENCE,2022,9.

Liu, Bochen.,Guo, Yue.,Su, Qiang.,Zhan, Yunfeng.,Chen, Zhao.,...&Wong, Wai-Yeung.(2022).Cadmium-Doped Zinc Sulfide Shell as a Hole Injection Springboard for Red, Green, and Blue Quantum Dot Light-Emitting Diodes.ADVANCED SCIENCE,9.

Liu, Bochen,et al."Cadmium-Doped Zinc Sulfide Shell as a Hole Injection Springboard for Red, Green, and Blue Quantum Dot Light-Emitting Diodes".ADVANCED SCIENCE 9(2022).