文献类型：期刊文献

英文题名：Dual Emissive Manganese and Copper Co-Doped Zn-In-S Quantum Dots as a Single Color-Converter for High Color Rendering White-Light-Emitting Diodes

作者：Yuan, Xi[1];Ma, Ruixin[1];Zhang, Wenjin[2];Hua, Jie[1,3];Meng, Xiangdong[1];Zhong, Xinhua[2];Zhang, Jiahua[4];Zhao, Jialong[1];Li, Haibo[1,3]

机构：[1]Jilin Normal Univ, Key Lab Funct Mat Phys & Chem, Minist Educ, Siping 136000, Peoples R China;[2]E China Univ Sci & Technol, Inst Appl Chem, Shanghai 200237, Peoples R China;[3]Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China;[4]Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Luminescence & Applicat, Changchun 130033, Peoples R China

年份：2015

卷号：7

期号：16

起止页码：8659

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20151900824596);WOS:【SCI-EXPANDED(收录号:WOS:000353931300036)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 11274304, 21371071, and 61275047) and the Research Project of Chinese Ministry of Education (No. 213009A).

语种：英文

外文关键词：white light emitting diodes; (Mn,Cu) co-doped quantum dots; quantum dots; energy transfer; nanocrystals

摘要：Novel white light emitting diodes (LEDs) with environmentally friendly dual emissive quantum dots (QDs) as single color-converters are one of the most promising high-quality solid-state lighting sources for meeting the growing global demand for resource sustainability. A facile method was developed for the synthesis of the bright greenred-emitting Mn and Cu codoped ZnInS QDs with an absorption bangdgap of 2.56 eV (485 nm), a large Stokes shift of 150 nm, and high emission quantum yield up to 75%, which were suitable for warm white LEDs based on blue GaN chips. The wide photoluminescence (PL) spectra composed of Cu-related green and Mn-related red emissions in the codoped QDs could be controlled by varying the doping concentrations of Mn and Cu ions. The energy transfer processes in Mn and Cu codoped QDs were proposed on the basis of the changes in PL intensity and lifetime measured by means of steady-state and time-resolved PL spectra. By integrating these bicolor QDs with commercial GaN-based blue LEDs, the as-fabricated tricolor white LEDs showed bright natural white light with a color rendering index of 95, luminous efficacy of 73.2 lm/W, and color temperature of 5092 K. These results indicated that (Mn,Cu):ZnInS/ZnS QDs could be used as a single color-converting material for the next generation of solid-state lighting.