Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, and I): Novel Optoelectronic Materials Showing Bright Emission with Wide Color Gamut

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• 作者：Loredana Protesescu ; Sergii Yakunin ; Maryna I. Bodnarchuk ; Franziska Krieg ; Riccarda Caputo ; Christopher H. Hendon ; Ruo Xi Yang ; Aron Walsh ; Maksym V. Kovalenko
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：June 10, 2015
• 年：2015
• 卷：15
• 期：6
• 页码：3692-3696
• 全文大小：391K
• ISSN：1530-6992

文摘

Metal halides perovskites, such as hybrid organic鈥搃norganic 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鈥?5 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鈥?00 nm. The photoluminescence of CsPbX₃ nanocrystals is characterized by narrow emission line-widths of 12鈥?2 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鈥?9 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鈥?30 nm), where typical metal chalcogenide-based quantum dots suffer from photodegradation.