Journal
NANO LETTERS
Volume 15, Issue 8, Pages 4935-4941Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00678
Keywords
Organic-inorganic perovskite; photoluminescence; lasing passivation; cholesteric liquid crystal; flexible; amplified spontaneous emission
Categories
Funding
- European Union [604032]
- Royal Society
- Herschel Smith Research Fellowship
- Dutch Polymer Institute (DPI) [764]
- Engineering and Physical Sciences Research Council
- Merck Chemicals
- EPSRC [EP/L024667/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L024667/1, 1507362] Funding Source: researchfish
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Organic-inorganic perovskites are highly promising solar cell materials with laboratory-based power conversion efficiencies already matching those of established thin film technologies. Their exceptional photovoltaic performance is in part attributed to the presence of efficient radiative recombination pathways, thereby opening up the possibility of efficient light-emitting devices. Here, we demonstrate optically pumped amplified spontaneous emission (ASE) at 780 urn from a 50 nm-thick film of CH3NH3PbI3 perovskite that is sandwiched within a cavity composed of a thin-film (similar to 7 mu m) cholesteric liquid crystal (CLC) reflector and a metal back-reflector. The threshold fluence for ASE in the perovskite film is reduced by at least two orders of magnitude in the presence of the CLC reflector, which results in a factor of two reduction in threshold fluence compared to previous reports. We consider this to be due to improved coupling of the oblique and out-of-plane modes that are reflected into the bulk in addition to any contributions from cavity modes. Furthermore, we also demonstrate enhanced ASE on flexible reflectors and discuss how improvements in the quality factor and reflectivity of the CLC layers could lead to single-mode lasing using CLC reflectors. Our work opens up the possibility of fabricating widely wavelength-tunable mirror-less single-mode lasers on flexible substrates, which could find use in applications such as flexible displays and friend or foe identification.
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