Engineering triangular carbon quantum dots with unprecedented narrow bandwidth emission for multicolored LEDs
Fanglong Yuan,Ting Yuan,Laizhi Sui,Laizhi Sui,Zhibin Wang,Zifan Xi,Yunchao Li,Xiaohong Li,Louzhen Fan,Zhan'ao Tan,Zhan'ao Tan,Anmin Chen,Mingxing Jin,Shihe Yang +13 more
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TLDR
This work demonstrates multicolored narrow bandwidth emission from triangular CQDs with a quantum yield up to 54–72% and synthesizes these dots showing tunable emission color, high fluorescence and a narrow FWHM of only 30 nanometers, which will set the stage for developing next-generation high-performance C QDs-based light-emitting diodes.Abstract:
Carbon quantum dots (CQDs) have emerged as promising materials for optoelectronic applications on account of carbon’s intrinsic merits of high stability, low cost, and environment-friendliness. However, the CQDs usually give broad emission with full width at half maximum exceeding 80 nm, which fundamentally limit their display applications. Here we demonstrate multicolored narrow bandwidth emission (full width at half maximum of 30 nm) from triangular CQDs with a quantum yield up to 54–72%. Detailed structural and optical characterizations together with theoretical calculations reveal that the molecular purity and crystalline perfection of the triangular CQDs are key to the high color-purity. Moreover, multicolored light-emitting diodes based on these CQDs display good stability, high color-purity, and high-performance with maximum luminance of 1882–4762 cd m−2 and current efficiency of 1.22–5.11 cd A−1. This work will set the stage for developing next-generation high-performance CQDs-based light-emitting diodes.read more
Citations
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Evolution and Synthesis of Carbon Dots: From Carbon Dots to Carbonized Polymer Dots
TL;DR: CPDs are revealed as an emerging class of CDs with distinctive polymer/carbon hybrid structures and properties, and critical insights into facilitating their potential in various application fields are proposed.
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Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications
Junjun Liu,Rui Li,Bai Yang +2 more
TL;DR: This Outlook comprehensively summarize the classification of CDs based on the analysis of their formation mechanism, micro-/nanostructure and property features, and describe their synthetic methods and optical properties including strong absorption, photoluminescence, and phosphorescence.
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Ultrafast Optical-Pump Terahertz-Probe Spectroscopy of the Carrier Relaxation and Recombination Dynamics in Epitaxial Graphene
Paul A. George,Jared H. Strait,Jahan M. Dawlaty,Shriram Shivaraman,Mvs Chandrashekhar,Farhan Rana,Michael G. Spencer +6 more
TL;DR: In this paper, the ultrafast relaxation and recombination dynamics of photogenerated electrons and holes in epitaxial graphene were studied using optical-pump Terahertz-probe spectroscopy.
Journal ArticleDOI
Full-color fluorescent carbon quantum dots
Liang Wang,Liang Wang,Weitao Li,Luqiao Yin,Yijian Liu,Huazhang Guo,Jiawei Lai,Yu Han,Gao Li,Ming Li,Jianhua Zhang,Robert Vajtai,Pulickel M. Ajayan,Minghong Wu +13 more
TL;DR: The universal electron-donating/withdrawing group engineering approach for synthesizing tunable emissive CQDs will facilitate the progress of carbon-based luminescent materials for manufacturing forward-looking films and devices.
Journal ArticleDOI
Deep Red Emissive Carbonized Polymer Dots with Unprecedented Narrow Full Width at Half Maximum
Junjun Liu,Yijia Geng,Daowei Li,Hua Yao,Zepeng Huo,Yunfeng Li,Kai Zhang,Shoujun Zhu,Haotong Wei,Weiqing Xu,Jinlan Jiang,Bai Yang +11 more
TL;DR: Deep red emissive carbonized polymer dots (CPDs) with unprecedented FWHM of 20 nm are synthesized and exhibit strong absorption and emission in the deep red light region, low toxicity, and good biocompatibility, making them an efficient probe for both one-photon and two- photon bioimaging.
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