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陈煜组与重庆大学唐孝生组等合作在Small上发表论文

发布者:王晴发布时间:2019-06-03浏览次数:24


题目: Ultrathin, Core–Shell Structured SiO2 Coated Mn2+‐Doped Perovskite Quantum Dots for Bright White Light‐Emitting Diodes

  

作者: Xiaosheng Tang1, Weiwei Chen1, Zhengzheng Liu2, Juan Du2*, Zhiqiang Yao3, Yi Huang4, Cheng Chen5, Zhaoqi Yang6, Tongchao Shi2, Wei Hu1, Zhigang Zang1, Yu Chen7*, Yuxin Leng2*

  

单位:

1. Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoeletronic Engineering, Chongqing University, Chongqing 400044, China

2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

3. State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials (ICDLCEM), School of Materials Science and Engineering, Zhengzhou University

Zhengzhou, 450001, China

4. College of Optoeletronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China

5. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing

School of materials science and engineering, Wuhan University of Technology, Wuhan, 430070, China

6. School of Pharmaceutical Sciences, Jiangnan University, Jiangsu, 214122, China

7. School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China

  

摘要: All‐inorganic semiconductor perovskite quantum dots (QDs) with outstanding optoelectronic properties have already been extensively investigated and implemented in various applications. However, great challenges exist for the fabrication of nanodevices including toxicity, fast anion‐exchange reactions, and unsatisfactory stability. Here, the ultrathin, core–shell structured SiO2 coated Mn2+ doped CsPbX3 (X = Br, Cl) QDs are prepared via one facile reverse microemulsion method at room temperature. By incorporation of a multibranched capping ligand of trioctylphosphine oxide, it is found that the breakage of the CsPbMnX3 core QDs contributed from the hydrolysis of silane could be effectively blocked. The thickness of silica shell can be well‐controlled within 2 nm, which gives the CsPbMnX3@SiO2 QDs a high quantum yield of 50.5% and improves thermostability and water resistance. Moreover, the mixture of CsPbBr3 QDs with green emission and CsPbMnX3@SiO2 QDs with yellow emission presents no ion exchange effect and provides white light emission. As a result, a white light‐emitting diode (LED) is successfully prepared by the combination of a blue on‐chip LED device and the above perovskite mixture. The as‐prepared white LED displays a high luminous efficiency of 68.4 lm W1 and a high color‐rendering index of Ra = 91, demonstrating their broad future applications in solid‐state lighting fields.

  

影响因子: 9.59

  

分区情况: 一区

  

链接:https://onlinelibrary.wiley.com/doi/full/10.1002/smll.201900484