Bright visible light emission from graphene
Bright visible light emission from graphene
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DOI：
10.1038/nnano.2015.118
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发表时间：
2015-08-01
影响因子：
38.3
通讯作者：
Park, Yun Daniel
中科院分区：
文献类型：
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作者：
Kim, Young Duck;Kim, Hakseong;Park, Yun Daniel
石墨烯和相关的二维材料是原子级薄、柔性和透明光电子学的有前途的候选者（1，2）。特别地，石墨烯（3）中的强的光-物质相互作用已经允许开发最先进的光电探测器（4，5）、光调制器（6）和等离子体激元器件（7）。此外，SiO2衬底上的电偏置石墨烯可用作中红外范围内的低效率发射器（8，9）。然而，在可见光范围内的发射仍然难以捉摸。在这里，我们报告观察到明亮的可见光发射从电偏置悬浮石墨烯设备。在这些装置中，热传输大大减少（10）。因此，热电子（类似于2，800 K）在空间上局限于石墨烯层的中心，导致热辐射效率提高1，000倍（8，9）。此外，悬浮的石墨烯和衬底之间的强光学干涉可用于调谐发射光谱。我们还通过实现化学气相沉积石墨烯发光体阵列来展示这种技术的可扩展性。这些结果为实现商业上可行的大规模、原子级薄、柔性和透明的光发射器和显示器铺平了道路，这些光发射器和显示器具有低工作电压和基于石墨烯的片上超快光通信。
Graphene and related two-dimensional materials are promising candidates for atomically thin, flexible and transparent opto-electronics(1,2). In particular, the strong light-matter interaction in graphene(3) has allowed for the development of state-of-the-art photodetectors(4,5), optical modulators(6) and plasmonic devices(7). In addition, electrically biased graphene on SiO2 substrates can be used as a low-efficiency emitter in the mid-infrared range(8,9). However, emission in the visible range has remained elusive. Here, we report the observation of bright visible light emission from electrically biased suspended graphene devices. In these devices, heat transport is greatly reduced(10). Hot electrons (similar to 2,800 K) therefore become spatially localized at the centre of the graphene layer, resulting in a 1,000-fold enhancement in thermal radiation efficiency(8,9). Moreover, strong optical interference between the suspended graphene and substrate can be used to tune the emission spectrum. We also demonstrate the scalability of this technique by realizing arrays of chemical-vapour-deposited graphene light emitters. These results pave the way towards the realization of commercially viable large-scale, atomically thin, flexible and transparent light emitters and displays with low operation voltage and graphene-based on-chip ultrafast optical communications.