Journal
ACS NANO
Volume 11, Issue 11, Pages 11368-11375Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b05935
Keywords
touch response; light emitting; perovskite; flexible; transparent; silver nanowires
Categories
Funding
- Air Force Office of Scientific Research [FA9550-15-1-0340]
- Taiwan Ministry of Education for MOE Technologies Incubation Scholarship
- Nano and Pico Characterization Lab at the California NanoSystems Institute
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A light-emitting touch-responsive device (LETD) for instantaneous visualization of pressure mapping is reported. The LETD integrates an organometal halide perovskite polymer composite emissive layer and a flexible silver nanowire polyurethane composite transparent electrode. The composite emissive layer contains methyl ammonium lead bromide nanocrystals uniformly dispersed in a poly(ethylene oxide) (PEO) matrix and emits an intense green luminescence that peaks at 529 nm. The PEO matrix promotes the formation of small perovskite grains (similar to 20 nm) and a pinhole-free composite film with surface roughness of only 2.96 nm. The composite transparent electrode is separated from the emissive layer with a 100 mu m thick spacer. When a local pressure is applied, a Schottky contact is formed instantaneously between the metal and the emissive layer, and electroluminescence is produced at voltages as low as 2.5 V and reaches 1030 cd/m(2) at 6 V. The transparent LETD has approximately 68% transparency. It can be bent to a 6 mm radius when polyethylene terephthalate is used as the substrate. The perovskite LETD has fast response and can be pixelated to offer potential applications in robotics, motion detection, fingerprint devices, and interactive wallpapers.
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