Temperature-Dependent Fluorescence in Carbon Dots
Temperature-Dependent Fluorescence in Carbon Dots
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DOI：
10.1021/jp307308z
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发表时间：
2012-11
影响因子：
3.7
通讯作者：
Pyng Yu;X. Wen;Yon‐Rui Toh;Jau Tang
中科院分区：
文献类型：
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作者：
Pyng Yu;X. Wen;Yon‐Rui Toh;Jau Tang
碳点是一种具有成本效益、环境友好且生物相容的纳米颗粒，在光电子学和生物光子学中具有许多潜在应用。观察到它们的双荧光带，并可归因于芯态和表面态发射。我们还进行从低温到室温的温度依赖性荧光测量。双发射带表现出类似的温度依赖性。强的电子-电子相互作用和弱的电子-声子相互作用可以解释即使在77 K也有很宽的光致发光带。我们的实验结果还表明，碳量子点表现出类似的温度行为的金属量子点（纳米团簇），但不同于无机半导体量子点。在这里，第一次，我们提出了温度依赖的光谱结果，目前还不清楚的荧光机制上的一些光。
Carbon dots are cost-effective, environmental friendly, and biocompatible nanoparticles with many potential applications in optoelectronics and biophotonics. Their dual fluorescence bands were observed and could be attributed to core and surface state emission. We also conduct temperature-dependent fluorescence measurements from cryogenic to room temperatures. The dual emission bands exhibit similar temperature dependence. The strong electron–electron interactions and weak electron–phonon interactions could account for the very broad photoluminescence (PL) band even at 77 K. Our experimental results also suggest that carbon dots exhibit similar temperature behavior as metallic quantum dots (nanoclusters) but are different from inorganic semiconductor quantum dots. Here, for the first time, we present the temperature-dependent spectroscopic results to shed some light on the presently unclear fluorescence mechanism.