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Start Over Descriptor "light‐emitting transistors" Publisher elsevier bv
2 results on '"light‐emitting transistors"'

1. Multi-color light-emitting transistors composed of organic single crystals

Author

Taku Hasobe, Satria Zulkarnaen Bisri, Hajime Nakanotani, Yohei Yomogida, Chihaya Adachi, Kosuke Sawabe, Taishi Takenobu, Yoshihiro Iwasa, Hayato Sakai, Shota Gocho, and Photophysics and OptoElectronics

Subjects
EFFICIENCY, Materials science, Organic single crystal, Ambipolar transistors, RECOMBINATION, Green-light, law.invention, Biomaterials, Optics, Impurity, law, Materials Chemistry, Electrical and Electronic Engineering, Astrophysics::Galaxy Astrophysics, business.industry, Ambipolar diffusion, Transistor, Light-emitting transistors, General Chemistry, Polarizer, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Dipole, Optoelectronics, Field-effect transistor, Light emission, FIELD-EFFECT TRANSISTORS, EMISSION, business
Abstract

We report a novel concept for multi-color light emission from an ambipolar organic single-crystal transistor using natural optical waveguides, the self-absorption effect, Davydov splitting and the unique alignment of the transition dipole moments. We used 9,10-bis(2,2-diphenylvinyl)-anthracene single crystals to produce blue and green light from identical single-crystal transistors. We also observed red light, which corresponds to the emission from in-gap states that are caused by impurities. Importantly, each of these different colors corresponds to a distinguishable light polarization, which enables us to tune the emission color by using a light polarizer. (C) 2013 Elsevier B. V. All rights reserved.

Published
2013

2. Efficient and bright polymer light emitting field effect transistors

Author

Ullah, Mujeeb, Tandy, Kristen, Yambem, Soniya, Muhieddine, Khalid, Ong, Wen Jie, Shi, Zugui, Burn, Paul, Meredith, Paul, Li, Jun, Namdas, Ebinazar, Ullah, Mujeeb, Tandy, Kristen, Yambem, Soniya, Muhieddine, Khalid, Ong, Wen Jie, Shi, Zugui, Burn, Paul, Meredith, Paul, Li, Jun, and Namdas, Ebinazar

Abstract

Light emitting field effect transistors (LEFETs) are emerging as a multi-functional class of optoelectronic devices. LEFETs can simultaneously execute light emission and the standard logic functions of a transistor in a single architecture. However, current LEFET architectures deliver either high brightness or high efficiency but not both concurrently, thus limiting their use in technological applications. Here we show an LEFET device strategy that simultaneously improves brightness and efficiency. The key step change in LEFET performance arises from the bottom gate top-contact device architecture in which the source/drain electrodes are semitransparent and the active channel contains a bi-layer comprising of a high mobility charge-transporting polymer, and a yellow-green emissive polymer. A record external quantum efficiency (EQE) of 2.1% at 1000cd/m2 is demonstrated for polymer based bilayer LEFETs.

Published
2015

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