Solution-processed photodetectors from colloidal silicon nano/micro particle composite

Tu, Chang-Ching; Tang, Liang; Huang, Jiangdong; Voutsas, Apostolos T.; Lin, Lih Y.

doi:10.1364/oe.18.021622

Cited by 18 publications

(4 citation statements)

References 20 publications

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“…At 405-nm and 450-nm excitation, the PL intensity was 90% and 55% of the maximum, respectively. The absorbance (or extinction) has a much broader spectrum than the excitation, due to a combination of scattering and absorption effects by the micron-size cores [14]. Especially at wavelengths longer than 550 nm, the absorbance of the phosphor suspension simply does not contribute to PL.…”

Section: Resultsmentioning

confidence: 99%

Red-emitting silicon quantum dot phosphors in warm white LEDs with excellent color rendering

Tu¹,

Hoo²,

Böhringer³

et al. 2014

Opt. Express

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We demonstrate red-emitting silicon quantum dot (SiQD) phosphors as a low-cost and environment-friendly alternative to rare-earth element phosphors or CdSe quantum dots. After surface passivation, the SiQD-phosphors achieve high photoluminescence quantum yield = 51% with 365-nm excitation. The phosphors also have a peak photoluminescence wavelength at 630 nm and a full-width-at-half-maximum of 145 nm. The relatively broadband red emission is ideal for forming the basis of a warm white spectrum. With 365-nm or 405-nm LED pumping and the addition of green- and/or blue-emitting rare-earth element phosphors, warm white LEDs with color rendering index ~95 have been achieved.

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Section: Resultsmentioning

confidence: 99%

Red-emitting silicon quantum dot phosphors in warm white LEDs with excellent color rendering

Tu¹,

Hoo²,

Böhringer³

et al. 2014

Opt. Express

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“…In this work, the SiQDs were synthesized by electrochemical etching of Si wafer, followed by surface passivation through hydrosilylation and ultrasonication for dispersing the QDs in solvents. 14 In the electrochemical etching reaction, we etched p-type boron-doped Si wafers with ͑100͒ orientation and 5 -20 ⍀ cm resistivity under stirring in a mixture of hydrofluoric acid ͑HF͒, methanol, hydrogen peroxide ͑H 2 O 2 ͒, and polyoxometalates ͑POMs͒, where the latter two ingredients function as catalysts. 15 A mild etching recipe was used ͑etching current density= 10 mA/ cm 2 , etching time= 2 h, and small amount of H 2 O 2 ͒ in order to avoid the formation of too many microsize pores on the wafer surface.…”

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confidence: 99%

Visible electroluminescence from hybrid colloidal silicon quantum dot-organic light-emitting diodes

Tang²,

Huang³

et al. 2011

Applied Physics Letters

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We demonstrate hybrid colloidal silicon quantum dot (SiQD)-organic light-emitting diodes with electroluminescence (EL) in the visible wavelengths. The device using blue photoluminescence (PL) SiQDs as emitters shows multiple EL peaks which are attributed to carrier recombination in the core quantum confinement states, the hole-transport-layer and the surface trap states, respectively. However, the red PL SiQD device shows a single EL peak consistent with the PL peak. These findings are in agreement with the previous report that large Stokes shift were observed for oxidized blue emission SiQDs due to oxide states while red emission SiQDs show negligible PL shift after oxidation.

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“…This fast development is particularly due to its potential use in the field of optical biosensors, electronic circuits, automobiles, drug carriers, microelectronics packing, shielding material, coating, fire-retardant, bullet proof jackets, etc. [5,6,7,8,9,10]. Basically nanocomposites are the mixtures of matrix of standard materials and nano sized particles such that the effective amount of incorporated nano particles remains between 0.5 to 5 % to achieve the dramatic improvement in the properties of matrix of standard materials [10].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Study of Ultra High Molecular Weight Polyethylene (UHMWPE) and Mg-Ni-doped ZnFe<SUB>2</SUB>O<SUB>3</SUB> Nano Composites

Azam¹,

Mehmood²

2020

PMC

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The present study aims at investigating the effect of incorporating nano scale Mg x Ni x Zn 1-x Fe 2 O 3 (where x=0.15) as nano fillers on the physical and chemical stability of ultra high molecular weight polyethylene (UHMWPE). The effect of adding 1% and 2% (by weight) nano fillers on the physicochemical properties of UHMWPE/Mg x Ni x Zn 1-x Fe 2 O 3 nano composites have also been investigated by using FTIR, Raman, and UV-VIS spectroscopy. FTIR data of UHMWPE/Mg x Ni x Zn 1-x Fe 2 O 3 nano composites reveal that the addition of Mg x Ni x Zn 1-x Fe 2 O 3 up to 1% induces significant chemical and physical structural alterations in UHMWPE matrix. However, this behavior is found to reduce on increasing the concentration of nano fillers from 1% to 2%. Raman spectroscopic data shows that crystalline contents of UHMWPE remain unaffected with the addition of nano fillers, however; a significant increase in amorphous contents and decrease in all-trans interphase region is observed. This behavior is attributed to the chain scission reactions due to addition of Mg x Ni x Zn 1-x Fe 2 O 3 followed by compression moulding process at high pressure and elevated temperature. Absorption spectroscopy analysis revealed that the incorporation of Mg x Ni x Zn 1-x Fe 2 O 3 results in decrease of energy band gaps from 2.14 eV to 2.08 eV (for direct transition) and from 1.54 eV to 1.38eV (for indirect transition) due to band gap energy which is induced because of Mg x Ni x Zn 1-x Fe 2 O 3 incorporation as nano fillers within the PE matrix.

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Solution-processed photodetectors from colloidal silicon nano/micro particle composite

Cited by 18 publications

References 20 publications

Red-emitting silicon quantum dot phosphors in warm white LEDs with excellent color rendering

Red-emitting silicon quantum dot phosphors in warm white LEDs with excellent color rendering

Visible electroluminescence from hybrid colloidal silicon quantum dot-organic light-emitting diodes

Spectroscopic Study of Ultra High Molecular Weight Polyethylene (UHMWPE) and Mg-Ni-doped ZnFe<SUB>2</SUB>O<SUB>3</SUB> Nano Composites

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