TY - JOUR
T1 - Highly emissive and color-tunable CuInS 2-based colloidal semiconductor nanocrystals
T2 - Off-stoichiometry effects and improved electroluminescence performance
AU - Chen, Bingkun
AU - Zhong, Haizheng
AU - Zhang, Wenqing
AU - Tan, Zhan'Ao
AU - Li, Yongfang
AU - Yu, Cairan
AU - Zhai, Tianyou
AU - Bando, Yoshio
AU - Yang, Shengyi
AU - Zou, Bingsuo
PY - 2012/5/23
Y1 - 2012/5/23
N2 - The off-stoichiometry effects and gram-scale production of luminescent CuInS 2-based semiconductor nanocrystals, as well as their application in electroluminescence devices are reported. The crystal structures and optical properties of CuInS 2 nanocrystals can be significantly influenced by controlling their [Cu]/[In] molar ratio. A simple model adapted from the bulk materials is proposed to explain their off-stoichiometry effects. Highly emissive and color-tunable CuInS 2-based NCs are prepared by a combination of [Cu]/[In] molar ratio optimization, ZnS shell coating, and CuInS 2-ZnS alloying. The method is simple, hassle-free, and easily scalable to fabricate tens of grams of nanocrystal powders with photoluminescence quantum yields up to around 65%. Furthermore, the performance of high-quality CuInS 2-based NCs in electroluminescence devices is examined. These devices have lower turn-on voltages of around 5 V, brighter luminance up to approximately 2100 cd m -2 and improved injection efficiency of around 0.3 lm W -1 (at 100 cd m -2) in comparison to recent reports.
AB - The off-stoichiometry effects and gram-scale production of luminescent CuInS 2-based semiconductor nanocrystals, as well as their application in electroluminescence devices are reported. The crystal structures and optical properties of CuInS 2 nanocrystals can be significantly influenced by controlling their [Cu]/[In] molar ratio. A simple model adapted from the bulk materials is proposed to explain their off-stoichiometry effects. Highly emissive and color-tunable CuInS 2-based NCs are prepared by a combination of [Cu]/[In] molar ratio optimization, ZnS shell coating, and CuInS 2-ZnS alloying. The method is simple, hassle-free, and easily scalable to fabricate tens of grams of nanocrystal powders with photoluminescence quantum yields up to around 65%. Furthermore, the performance of high-quality CuInS 2-based NCs in electroluminescence devices is examined. These devices have lower turn-on voltages of around 5 V, brighter luminance up to approximately 2100 cd m -2 and improved injection efficiency of around 0.3 lm W -1 (at 100 cd m -2) in comparison to recent reports.
KW - CuInS
KW - colloidal nanocrystals
KW - electroluminescence
KW - light-emitting diodes
KW - photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=84861145715&partnerID=8YFLogxK
U2 - 10.1002/adfm.201102496
DO - 10.1002/adfm.201102496
M3 - Article
AN - SCOPUS:84861145715
SN - 1616-301X
VL - 22
SP - 2081
EP - 2088
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 10
ER -