Amplified Spontaneous Green Emission and Lasing Emission From Carbon Nanoparticles
Amplified Spontaneous Green Emission and Lasing Emission From Carbon Nanoparticles
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碳纳米粒子的放大自发绿色发射和激光发射
DOI：
10.1002/adfm.201303352
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发表时间：
2014-05-01
影响因子：
19
通讯作者：
Shen, Dezhen
中科院分区：
文献类型：
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作者：
Qu, Songnan;Liu, Xingyuan;Shen, Dezhen
在这项工作中，碳纳米粒子（CNPs）的光学性质可以通过掺杂剂n原子和sp(2) c含量来调节。低尿素质量比制备的CNPs （CNP1）表现出蓝色发光（最大PL量子产率为15%）。在高尿素质量比为2:1 （CNP2）制备的CNPs中，增加sp(2) C-和掺杂剂n原子的含量，可导致绿色发光（在乙醇水溶液中最大PL量子产率可达36%）。扩增自发辐射（ASE）仅在CNP2乙醇水溶液中观察到。在线性长法布里-珀罗腔中，CNP2乙醇水溶液实现了绿色激光发射，表明了CNP2作为激光增益介质的潜力。与C545T染料相比，CNP2具有更好的光稳定性。推测CNP2的绿色发射来自于电子-空穴复合（本征态发射）。高PL量子产率和CNP2乙醇水溶液吸收和发射重叠小是实现激光发射的关键因素。
In this work, the optical properties of carbon nanoparticles (CNPs) can be modulated by the dopant-N atom and sp(2) C-contents. CNPs prepared with the low urea mass ratio of 0.2:1 (CNP1) exhibit blue emission (maximum PL quantum yield: 15%). Increasing sp(2) C- and dopant-N atom contents, as determined in CNPs prepared with high urea mass ratio of 2:1 (CNP2), lead to green emission (maximum PL quantum yield up to 36% in ethanol aqueous solution). Amplified spontaneous emission (ASE) can be observed only in CNP2 ethanol aqueous solution. Green lasing emission is achieved from CNP2 ethanol aqueous solution in a linear long Fabry-Perot cavity, indicating the potential of CNP2 as a gain medium for lasing. CNP2 shows superior photostability compared with C545T dye. The green emission from CNP2 is speculated to arise from electron-hole recombination (intrinsic state emission). The high PL quantum yield and small overlap between absorption and emissions of CNP2 ethanol aqueous solution are the key factors in realizing lasing emission.