光致发光
卤化物
材料科学
钙钛矿(结构)
光电子学
纳米晶
量子点
硫系化合物
纳米技术
化学
无机化学
结晶学
作者
Loredana Proteşescu,Sergii Yakunin,Maryna I. Bodnarchuk,Franziska Krieg,Riccarda Caputo,Christopher H. Hendon,Ruoxi Yang,Aron Walsh,Maksym V. Kovalenko
出处
期刊:Nano Letters
[American Chemical Society]
日期:2015-02-02
卷期号:15 (6): 3692-3696
被引量:6750
摘要
Metal halides perovskites, such as hybrid organic-inorganic CH3NH3PbI3, are newcomer optoelectronic materials that have attracted enormous attention as solution-deposited absorbing layers in solar cells with power conversion efficiencies reaching 20%. Herein we demonstrate a new avenue for halide perovskites by designing highly luminescent perovskite-based colloidal quantum dot materials. We have synthesized monodisperse colloidal nanocubes (4-15 nm edge lengths) of fully inorganic cesium lead halide perovskites (CsPbX3, X = Cl, Br, and I or mixed halide systems Cl/Br and Br/I) using inexpensive commercial precursors. Through compositional modulations and quantum size-effects, the bandgap energies and emission spectra are readily tunable over the entire visible spectral region of 410-700 nm. The photoluminescence of CsPbX3 nanocrystals is characterized by narrow emission line-widths of 12-42 nm, wide color gamut covering up to 140% of the NTSC color standard, high quantum yields of up to 90%, and radiative lifetimes in the range of 1-29 ns. The compelling combination of enhanced optical properties and chemical robustness makes CsPbX3 nanocrystals appealing for optoelectronic applications, particularly for blue and green spectral regions (410-530 nm), where typical metal chalcogenide-based quantum dots suffer from photodegradation.
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