Radial Nanowire Light-Emitting Diodes in the (AlxGa1–x)yIn1–yP Material System

Berg, Alexis; Yazdi, Sadegh; Nowzari, Ali; Storm, Kristian; Jain, Vipul; Вайнорюс, Неймантас; Samuelson, Lars; Wagner, Jakob Birkedal; Borgström, Magnus T.

doi:10.1021/acs.nanolett.5b04401

Cited by 38 publications

(49 citation statements)

References 65 publications

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“…This flexibility in NW design and growth has enabled novel device applications including NW lasers 10,22,23 , light emitting and detection devices 2,[24][25][26] , ultrahigh density transistors 27 single-electron charging devices 28,29 as well as single photon emitters 15,30,31 and detectors 32 .…”

Section: Introductionmentioning

confidence: 99%

Population dynamics and dephasing of excitons and electron-hole pairs in polytype wurtzite/zinc-blende InP nanowires

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Population dynamics and dephasing of excitons and electron-hole pairs in polytype wurtzite/zinc-blende InP nanowires

et al. 2017

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“…11,12) In this study, we report the growth and characterization of WZ InP/AlGaP CMS NWs with QW structures for the green color spectrum. The WZ AlGaP at an Al composition of around 20% is expected to have the band gap energy in the green spectral region according to calculations of their band structures.…”

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confidence: 99%

Growth and characterization of wurtzite InP/AlGaP core–multishell nanowires with AlGaP quantum well structures

Ishizaka

Hiraya

Tomioka

et al. 2016

Jpn. J. Appl. Phys.

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We report on selective-area growth and characterization of wurtzite (WZ) InP/AlGaP core-multishell nanowires. Quantum well (QW) structures were fabricated in the AlGaP multishells by changing alloy compositions. Transmission electron microscopy revealed that the AlGaP multishell was grown with a WZ structure on side of the WZ InP core. The lattice constants of the WZ InP core and WZ AlGaP shell were determined by X-ray diffraction. Cathodoluminescence studies showed that the WZ AlGaP QW with an Al composition of 20% had green emissions at 2.37 eV. These results open the possibility for green light-emitting diodes using WZ AlGaP based materials. 2Color mixed RGB light-emitting diodes (LEDs) are promising candidates for future solidstate lightning and display technology due to their potential advantages in energy conversion efficiency and color rendering index (CRI). 1,2) However, achieving high efficient LEDs in the green region is challenging due to a lack of suitable semiconductor materials, which is known as the "green gap". 3,4) Non-nitride III-V materials having wurtzite (WZ) structures have recently offered a new approach to overcome this issue. Some theories predict that GaP and AlP in the WZ structures have direct band gaps in contrast to the conventional zinc blende (ZB) structures with indirect band gaps. [5][6][7] Although this approach has been experimentally demonstrated in WZ GaP 8,9) and WZ AlInP, 10) these WZ materials with quantum well (QW) structures required for LED applications have not been reported so far.In nanowire (NW) structures, radial core-multishell (CMS) NWs with QW structures are suitable structures for LED applications. 11,12) In this study, we report the growth and characterization of WZ InP/AlGaP CMS NWs with QW structures for the green color spectrum. The WZ AlGaP at an Al composition of around 20% is expected to have the band gap energy in the green spectral region according to calculations of their band structures. 6,7) The CMS NWs were synthesized by selective-area metal organic vapor phase epitaxy (SA-MOVPE). In SA-MOVPE, InP NWs can be grown with a pure WZ structure by properly adjusting the growth conditions. 13-15) Based on these WZ InP NWs, the crystal structure transfer method [16][17][18] was applied for the radial multishell growth. At first, a 20-nm-thick SiO 2 layer was deposited on an InP (111)A substrate using plasma sputtering, and the SiO 2 layer was partially removed using electron-beam (EB) lithography and wet chemical etching. The SiO 2 patterns were designed to be a periodic array of openings with a diameter of 130 nm.The SA-MOVPE was performed in a low-pressure MOVPE reactor using trimethylaluminum (TMAl), trimethylgallium (TMGa), trimethylindium (TMIn), and tertiarybutylphosphine 3 (TBP) as source materials. Prior to the growth, the native oxide on the openings was removed using thermal cleaning for 5 min at 600°C under a hydrogen and TBP ambient. After thermal cleaning, WZ InP NWs were grown for 15 min at 660°C with a V/III ratio of 18, which is t...

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“…Berg and co-workers have shown the potential of AlGaInP based nanowire system as a precursor for next-generation light-emitting diodes as indicated by the electro-optical properties measured by injection luminescence measurements [33]. In a similar line, Cheng et al, have achieved atomically thin transition metal dichalcogenides p-n diodes with distinct layer-number dependent emission characteristics to produce a highest external quantum efficiency up to 12% [34].…”

Section: Electro Chemo Iuminescent Nanoparticlesmentioning

confidence: 96%

Nano-Technological Approaches to Improve the Efficiency of Bio-Assays

Roy¹

2016

Glob J Biotechnol Biomater Sci

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One of the biggest issues in today's healthcare industry is to find a very fast yet effective diagnostic platform, which is suitable for our busy lifestyle without compromising the detection efficiency. The major requirements of an efficient diagnostic platform can be summarized as minimum sample requirement, least reagent requirement, having options of multiple tests in a single platform, high through put analysis and last but never the least a non-expensive sample run. The largest contributor of the bio-assay industry is protein based chromogenic bio-assays, which depends on strong antigen-antibody interaction and high emissive properties of reporter dye molecule attached to the antigen. In reality, this apparently simple looking reaction system has to face several difficulties before an appreciable signal is received by the photo-detector to give an analysable dataset. With the rapid emergence of nanotechnology during last few decades, some of the critical problems have been solved [1][2][3][4][5]. However, a large number of unresolved issues still remain there. This editorial will briefly address some of those critical issues and how they have been tackled by nanotechnology. The two-most tunable variables of a bio-assay platform are the reporter molecules and the sensing platform as described by the Figure 1. We will describe both the issues separately in the next sections. Optical efficiency of the reporter moleculeThe optical efficiency of a reporter molecule suffers from two major issues, firstly the biological auto-fluorescence and secondly the fluorescence quenching of the reporter dye by the aqueous environment. The biological autofluorescence originates from the

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Radial Nanowire Light-Emitting Diodes in the (Al_xGa_1–x)_yIn_1–yP Material System

Abstract: Vainorius, N. (2016). Radial nanowire lightemitting diodes in the (AlxGa1-x)yIn1-yP material system. Abstract from 18th International Conference on Crystal Growth and Epitaxy, Nagoya, Japan.

Cited by 38 publications

References 65 publications

Population dynamics and dephasing of excitons and electron-hole pairs in polytype wurtzite/zinc-blende InP nanowires

Population dynamics and dephasing of excitons and electron-hole pairs in polytype wurtzite/zinc-blende InP nanowires

Growth and characterization of wurtzite InP/AlGaP core–multishell nanowires with AlGaP quantum well structures

Nano-Technological Approaches to Improve the Efficiency of Bio-Assays

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