Dual Emissive Cu:InP/ZnS/InP/ZnS Nanocrystals: Single-Source 鈥淕reener鈥?Emitters with Flexibly Tunable Emission from Visible to Near-Infrared and Their Application in White Light-Emitting Diodes

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• 作者：Zhuolei Zhang ; Dong Liu ; Dongze Li ; Keke Huang ; Ying Zhang ; Zhan Shi ; Renguo Xie ; Ming-Yong Han ; Yue Wang ; Wensheng Yang
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：February 24, 2015
• 年：2015
• 卷：27
• 期：4
• 页码：1405-1411
• 全文大小：519K
• ISSN：1520-5002

文摘

Single-phase 鈥済reener鈥?phosphor with broadband emission made of colloidal quantum dots (QDs) is most desirable for use as color convertors in white light-emitting diodes (WLEDs). Here, we demonstrate a single 鈥渃admium-free鈥?component system consisting of Cu-doped InP core/ZnS barrier/InP quantum well/ZnS shell QDs, which exhibits two emission peaks by controlling the barrier thickness under single-excitation wavelength, one of which being attributed to Cu-doped InP, and the other resulting from InP quantum well. The dual emissive peaks were successfully tuned in a range from visible to near-infrared by simple control of the core size and the well thickness, respectively. Using optimal structures as color converters, we successfully obtained WLED with a color rending index (CRI) up to 91 and CIE color coordinates of (0.338, 0.330) by combination with blue LED chip, indicating this single-phase phosphor with great promise for use in solid-state lighting due to flexibly tunable dual emission peak position in the entire visible region.