Modulation of optical properties of ZnS QDs embedded glasses through aluminum and manganese doping

Journal of Materials Chemistry C ◽

10.1039/d1tc02285g ◽

2021 ◽

Author(s):

Kai Li ◽

Ying Ye ◽

Wenchao Zhang ◽

Yuzhou Hu ◽

Ying Yang ◽

...

Keyword(s):

Optical Properties ◽

Quantum Efficiency ◽

High Quantum Efficiency ◽

Information Display ◽

Manganese Doping ◽

High Quantum

Nontoxic cadmium-free ZnS and ZnSe QDs QDs with high quantum efficiency have drawn considerable attention for information display. Applications of ZnS and ZnSe QDs are limited by their short emission...

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Simultaneous, non-interfering collection of optimal fluorescent and backscattered light signals on the MRC 500/600

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010014662x ◽

1993 ◽

Vol 51 ◽

pp. 156-157

Author(s):

JB Pawley ◽

WB Amos ◽

A Dixon ◽

TC Brelje

Keyword(s):

Optical Properties ◽

Quantum Efficiency ◽

Fluorescent Dyes ◽

Living Cells ◽

Microscopical Examination ◽

High Quantum Efficiency ◽

Fluorescent Signal ◽

High Quantum ◽

Signal Collection ◽

Light Signals

One of the most important attributes of the confocal LM is that it can be used for imaging living cells. Unfortunately, cells that contain fluorescent dyes are far less tolerant of the intense illumination characteristic of microscopical examination than unstained cells. As a result, it early became evident that every effort should be made to extract as much information as possible from every photon striking the specimen. This implies not only utilizing detectors with high quantum efficiency but also detecting the light which is back-scattered by (BSL), or passing through, the specimen in addition to any fluorescent signal. Both transmitted light and BSL carry information about the optical properties of the specimen and it is possible to detect this information without compromising fluorescent signal collection.

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Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs

Materials ◽

10.3390/ma12193275 ◽

2019 ◽

Vol 12 (19) ◽

pp. 3275 ◽

Cited By ~ 4

Author(s):

Grigorjevaite ◽

Ezerskyte ◽

Minderyte ◽

Stanionyte ◽

Juskenas ◽

...

Keyword(s):

Optical Properties ◽

Quantum Efficiency ◽

Red Light ◽

Light Sources ◽

Quenching Temperature ◽

High Quantum Efficiency ◽

White Leds ◽

High Quantum ◽

Powder Samples ◽

Colour Coordinates

There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature. The reported Rb2Bi(PO4)(MoO4):Eu3+ phosphors have all these properties. The Rb2Bi(PO4)(MoO4):Eu3+ phosphors emit bright red light if excited with near-UV radiation. The calculated colour coordinates show good stability in the 77–500 K temperature range. Moreover, sample doped with 50% Eu3+ possesses quantum efficiency close to unity. Besides the powder samples, ceramic disks of Rb2Eu(PO4)(MoO4) specimen were also prepared, and the red light sources from these disks in combination with near-UV emitting LED were fabricated. The obtained results indicated that ceramic disks efficiently absorb the emission of 375 and 400 nm LED and could be applied as a red component in phosphor-converted white LEDs.

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Design and calculation of type-II superlattice resonant cavity-enhanced photodetector with high quantum efficiency and low dark current

Physica B Condensed Matter ◽

10.1016/j.physb.2021.413201 ◽

2021 ◽

pp. 413201

Author(s):

Ya-nan Du ◽

Lei Wang ◽

Yun Xu ◽

Guofeng Song

Keyword(s):

Quantum Efficiency ◽

Dark Current ◽

Resonant Cavity ◽

Type Ii ◽

High Quantum Efficiency ◽

High Quantum ◽

Type Ii Superlattice

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Highly Efficient Near-Infrared Detector Based on Optically Resonant Dielectric Nanodisks

Nanomaterials ◽

10.3390/nano11020428 ◽

2021 ◽

Vol 11 (2) ◽

pp. 428

Author(s):

Reza Masoudian Saadabad ◽

Christian Pauly ◽

Norbert Herschbach ◽

Dragomir N. Neshev ◽

Haroldo T. Hattori ◽

...

Keyword(s):

Quantum Efficiency ◽

High Speed ◽

Near Infrared ◽

Infrared Detector ◽

High Quantum Efficiency ◽

Fast Detection ◽

High Quantum ◽

Resonant Modes ◽

Infrared Wavelengths ◽

Dielectric Metasurface

Fast detection of near-infrared (NIR) photons with high responsivity remains a challenge for photodetectors. Germanium (Ge) photodetectors are widely used for near-infrared wavelengths but suffer from a trade-off between the speed of photodetection and quantum efficiency (or responsivity). To realize a high-speed detector with high quantum efficiency, a small-sized photodetector efficiently absorbing light is required. In this paper, we suggest a realization of a dielectric metasurface made of an array of subwavelength germanium PIN photodetectors. Due to the subwavelength size of each pixel, a high-speed photodetector with a bandwidth of 65 GHz has been achieved. At the same time, high quantum efficiency for near-infrared illumination can be obtained by the engineering of optical resonant modes to localize optical energy inside the intrinsic Ge disks. Furthermore, small junction capacitance and the possibility of zero/low bias operation have been shown. Our results show that all-dielectric metasurfaces can improve the performance of photodetectors.

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