期刊
2D MATERIALS
卷 5, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa97b5
关键词
graphene; hexagonal boron nitride; light emission; van der Waals heterostructures; phonon limited transport
资金
- EU Graphene Flagship Program
- European Research Council Synergy Grant Hetero2D
- Royal Society
- Engineering and Physical Research Council (EPSRC)
- US Army Research Office [W911NF-16-1-0279]
- EPSRC
- EPSRC Early Career Fellowship [EP/N007131/1]
- EPSRC [EP/N007131/1, EP/K005014/1, EP/N010345/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1495280, EP/N007131/1, EP/N010345/1, 1770358] Funding Source: researchfish
The excellent electronic and mechanical properties of graphene allow it to sustain very large currents, enabling its incandescence through Joule heating in suspended devices. Although interesting scientifically and promising technologically, this process is unattainable in ambient environment, because graphene quickly oxidises at high temperatures. Here, we take the performance of graphene-based incandescent devices to the next level by encapsulating graphene with hexagonal boron nitride (hBN). Remarkably, we found that the hBN encapsulation provides an excellent protection for hot graphene filaments even at temperatures well above 2000 K. Unrivalled oxidation resistance of hBN combined with atomically clean graphene/hBN interface allows for a stable light emission from our devices in atmosphere for many hours of continuous operation. Furthermore, when confined in a simple photonic cavity, the thermal emission spectrum is modified by a cavity mode, shifting the emission to the visible range spectrum. We believe our results demonstrate that hBN/graphene heterostructures can be used to conveniently explore the technologically important high-temperature regime and to pave the way for future optoelectronic applications of graphene-based systems.
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