Colloidal CdSe1鈥?i>xSx Nanoplatelets with Narrow and Continuously-Tunable Electroluminescence
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- 作者：Fengjia Fan ; Pongsakorn Kanjanaboos ; Mayuran Saravanapavanantham ; Eric Beauregard ; Grayson Ingram ; Emre Yassitepe ; Michael M. Adachi ; Oleksandr Voznyy ; Andrew K. Johnston ; Grant Walters ; Gi-Hwan Kim ; Zheng-Hong Lu ; Edward H. Sargent
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：July 8, 2015
- 年：2015
- 卷：15
- 期：7
- 页码：4611-4615
- 全文大小：374K
- ISSN：1530-6992
文摘
Colloidal nanoplatelets, quasi-two-dimensional quantum wells, have recently been introduced as colloidal semiconductor materials with the narrowest known photoluminescence line width (鈭?0 nm). Unfortunately, these materials have not been shown to have continuously tunable emission but rather emit at discrete wavelengths that depend strictly on atomic-layer thickness. Herein, we report a new synthesis approach that overcomes this issue: by alloying CdSe colloidal nanoplatelets with CdS, we finely tune the emission spectrum while still leveraging atomic-scale thickness control. We proceed to demonstrate light-emitting diodes with sub-bandgap turn-on voltages (2.1 V for a device emitting at 2.4 eV) and the narrowest electroluminescence spectrum (FWHM 鈭?2.5 nm) reported for colloidal semiconductor LEDs.