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Cost-Effective and Highly Photoresponsive Nanophosphor-P3HT Photoconductive Nanocomposite for Near-Infrared Detection.

Scientific reports (2015-11-17)
Yi Tong, Xinyu Zhao, Mei Chee Tan, Rong Zhao
ABSTRACT

The advent of flexible optoelectronic devices has accelerated the development of semiconducting polymeric materials. We seek to replace conventional expensive semiconducting photodetector materials with our cost-effective composite system. We demonstrate in this work the successful fabrication of a photoconductive composite film of poly(3-hexylthiophene-2,5-diyl) (P3HT) mixed with NaYF4:Yb,Er nanophosphors that exhibited a ultrahigh photoresponse to infrared radiation. The high photocurrent measured was enabled by the unique upconversion properties of NaYF4:Yb,Er nanophosphors, where low photon energy infrared excitations are converted to high photon energy visible emissions that are later absorbed by P3HT. Here we report, a significant 1.10 × 10(5) times increment of photocurrent from our photoconductive composite film upon infrared light exposure, which indicates high optical-to-electrical conversion efficiency. Our reported work lays the groundwork for the future development of printable, portable flexible and functional photonic composites for light sensing and harvesting, photonic memory devices, and phototransistors.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
甲苯, anhydrous, 99.8%
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甲苯, ACS reagent, ≥99.5%
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油酸, ≥99% (GC)
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三氟乙酸, puriss. p.a., suitable for HPLC, ≥99.0% (GC)
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三氟乙酸, ≥99%, for protein sequencing
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三氟乙酸钠, 98%
SAFC
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1-十八烯, ≥95.0% (GC)
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镱, ingot, 99.9% trace rare earth metals basis
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镱, foil, 25x25mm, thickness 0.125mm, as rolled, 99%
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