Journal
ADVANCED OPTICAL MATERIALS
Volume 6, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201800382
Keywords
perovskite nanocrystals; plasmonic; random lasers; ultralow threshold; vertical graphene nanowalls
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Funding
- Advanced Research Center of Green Materials Science and Technology - Ministry of Education [107L9006]
- Ministry of Science and Technology of the Republic of China [MOST107-3017-F-002-001]
- Ministry of Science and Technology [MOST 106-2811-M-002-118, MOST 105-2119-M-002-048-MY3]
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Application of lasers is omnipresent in modern-day technology. However, preparation of a lasing device usually requires sophisticated design of the materials and is costly, which may limit the suitable choice of materials and the lasing wavelengths. Random lasers, on the other hand, can circumvent the aforementioned shortcomings with simpler fabrication process, lower processing cost, material flexibility for any lasing wavelengths with lower lasing threshold, providing a roadmap for the design of super-bright lighting, displays, Li-Fi, etc. In this work, ultralow-threshold random laser action from semiconductor nanoparticles assisted by a highly porous vertical-graphene-nanowalls (GNWs) network is demonstrated. The GNWs embedded by the nanomaterials produce a suitable cavity for trapping the optical photons with semiconductor nanomaterials acting as the gain medium. The observed laser action shows ultralow values of threshold energy density approximate to 10 nJ cm(-2) due to the strong photon trapping within the GNWs. The threshold pump fluence can be further lowered to approximate to 1 nJ cm(-2) by coating Ag/SiO2 upon the GNWs due to the combined effect of photon trapping and strong plasmonic enhancement. In view of the growing demand of functional materials and novel technologies, this work provides an important step toward realization of high-performance optoelectronic devices.
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