title: Highly efficient near-infrared  light-emitting diodes by using type-II  CdTe/CdSe core/shell quantum dots  as a phosphor.
abstract: In this paper, we present an innovative method for the synthesis of CdTe/CdSe type-II core/shell structure quantum dots (QDs) using 'greener' chemicals. The PL of CdTe/CdSe type-II core/shell structure QDs ranges from 600 to 820 nm, and the as-synthesized core/shell structures show narrow size distributions and stable and high quantum yields (50–75%). Highly efficient near-infrared light-emitting diodes (LEDs) have been demonstrated by employing the CdTe/CdSe type-II core/shell QDs as emitters. The devices fabricated based on these type-II core/shell QDs show color-saturated near-infrared emission from the QD layers, a low turn-on voltage of 1.55 V, an external quantum efficiency (EQE) of 1.59%, and a current density and maximum radiant emittance of 2.1 × 10(3) mA cm−2 and 17.7 mW cm−2 at 8 V; it is the first report to use type-II core/shell QDs as near-infrared emitters and these results may offer a practicable platform for the realization of near-infrared QD-based light-emitting diodes, night-vision-readable displays, and friend/foe identification system.
authors.forename: Huaibin
authors.initials: H
authors.lastname: Shen
authors.forename: Ying
authors.initials: Y
authors.lastname: Zheng
authors.forename: Hongzhe
authors.initials: H
authors.lastname: Wang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Xu
authors.forename: Lei
authors.initials: L
authors.lastname: Qian
authors.forename: Yixing
authors.initials: Y
authors.lastname: Yang
authors.forename: Alexandre
authors.initials: A
authors.lastname: Titov
authors.forename: Jake
authors.initials: J
authors.lastname: Hyvonen
authors.forename: Lin Song
authors.initials: LS
authors.lastname: Li