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Near‐Band‐Edge Electroluminescence from Heavy‐Metal‐Free Colloidal Quantum Dots
Author(s) -
Tan Zhanao,
Zhang Yu,
Xie Chuang,
Su Huaipeng,
Liu Jie,
Zhang Chunfeng,
Dellas Nicholas,
Mohney Suzanne E.,
Wang Yongqiang,
Wang Jingkang,
Xu Jian
Publication year - 2011
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201100719
Subject(s) - electroluminescence , materials science , light emitting diode , quantum dot , optoelectronics , diode , luminance , colloid , metal , green light , optics , nanotechnology , blue light , metallurgy , chemical engineering , physics , engineering , layer (electronics)
The first observation of near‐band‐edge electroluminescent emission from the colloidal quantum dots (QDs) consisting of CuInS 2 ‐ZnS alloyed (ZCIS) cores and ZnSe/ZnS double shells is reported. Bright and organic‐free electroluminescence (EL) emission peaked at red ( λ = 623 nm), yellow ( λ = 594 nm), and green ( λ = 560 nm) wavelengths is observed from the heavy‐metal‐free QD light‐emitting diodes (QD‐LEDs). The onset voltages, luminance output uniformity, and efficiencies of the heavy‐metal‐free QD‐LEDs are characterized.