Excitation Wavelength Independence: Toward Low-Threshold Amplified Spontaneous Emission from Carbon Nanodots

	Excitation Wavelength Independence: Toward Low-Threshold Amplified Spontaneous Emission from Carbon Nanodots
	Zhang, Y. Q.; Y. S. Hu; J. Lin; Y. Fan; Y. T. Li; Y. Lv and X. Y. Liu
	2016
发表期刊	Acs Applied Materials & Interfaces
卷号	8 期号:38
摘要	Carbon nanodots (CDs) are known to be a superior type of lasing material due to their low cost, low toxicity, high photostability, and photobleaching resistance. Significant attention has been paid to synthesizing CDs with high fluorescence quantum yields (FLQYs) to achieve higher optical gains. In this report, we reveal that excitation wavelength-independent (lambda ex-independent) photoluminescence (PL) characteristics, rather than high FLQYs, should be given priority to realize CD-based light amplification. CDs with excitation wavelength-dependent (lambda ex-dependent) PL characteristics and FLQYs as high as 99% and 96% were found not to exhibit amplified spontaneous emission (ASE), while those with lambda ex-independent PL characteristics and FLQYs of only 38% and 82% realized ASE with low thresholds. The difficulty of achieving ASE using CDs with lambda ex-dependent PL characteristics is likely attributable to their high contents of C-O-H or C-O-C groups. These groups can induce numerous localized electronic states within the n-p* gap, which could decentralize the excited electrons, thus increasing the difficulty of population inversion. In addition, the radiative transition rates and stimulated emission cross sections of CDs with lambda ex-independent PL characteristics were found to be significantly higher than those of CDs with lambda ex-dependent PL characteristics. ASE in a planar waveguide structure, which is a practical structure for solid-state lasing devices, was also demonstrated for the first time using CDs with lambda ex-independent PL characteristics. These results provide simple and effective guidelines for synthesizing and selecting CDs for low-threshold lasing devices.
文章类型	期刊
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/57453
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhang, Y. Q.,Y. S. Hu,J. Lin,et al. Excitation Wavelength Independence: Toward Low-Threshold Amplified Spontaneous Emission from Carbon Nanodots[J]. Acs Applied Materials & Interfaces,2016,8(38).
APA	Zhang, Y. Q.,Y. S. Hu,J. Lin,Y. Fan,Y. T. Li,&Y. Lv and X. Y. Liu.(2016).Excitation Wavelength Independence: Toward Low-Threshold Amplified Spontaneous Emission from Carbon Nanodots.Acs Applied Materials & Interfaces,8(38).
MLA	Zhang, Y. Q.,et al."Excitation Wavelength Independence: Toward Low-Threshold Amplified Spontaneous Emission from Carbon Nanodots".Acs Applied Materials & Interfaces 8.38(2016).

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