Blue-Green Color Tunable Solution Processable Organolead Chloride鈥揃romide Mixed Halide Perovskites for Optoelectronic Applications

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• 作者：Aditya Sadhanala ; Shahab Ahmad ; Baodan Zhao ; Nadja Giesbrecht ; Phoebe M. Pearce ; Felix Deschler ; Robert L. Z. Hoye ; Karl C. G枚del ; Thomas Bein ; Pablo Docampo ; Si芒n E. Dutton ; Michael F. L. De Volder ; Richard H. Friend
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：15
• 期：9
• 页码：6095-6101
• 全文大小：409K
• ISSN：1530-6992

文摘

Solution-processed organo-lead halide perovskites are produced with sharp, color-pure electroluminescence that can be tuned from blue to green region of visible spectrum (425鈥?70 nm). This was accomplished by controlling the halide composition of CH₃NH₃Pb(Br_xCl_1鈥?i>x)₃ [0 鈮?x 鈮?1] perovskites. The bandgap and lattice parameters change monotonically with composition. The films possess remarkably sharp band edges and a clean bandgap, with a single optically active phase. These chloride鈥揵romide perovskites can potentially be used in optoelectronic devices like solar cells and light emitting diodes (LEDs). Here we demonstrate high color-purity, tunable LEDs with narrow emission full width at half maxima (FWHM) and low turn on voltages using thin-films of these perovskite materials, including a blue CH₃NH₃PbCl₃ perovskite LED with a narrow emission FWHM of 5 nm.