Prof. Wallace C. H. Choy Profile

Prof. Wallace C. H. Choy

Professor at Univ of Hong Kong

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 3 October 2022 Presentation + Paper

Crystallized 2D perovskite for x-ray and visible light detection applications

Lebin Nie, Jiayun Sun, Gang Li, Kai Wang, Wallace C. Choy

Proceedings Volume 12209, 1220903 (2022) https://doi.org/10.1117/12.2632581

KEYWORDS: Perovskite, Crystals, X-rays, Visible radiation, Sensors, X-ray detectors, Absorption, Photodetectors

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Proceedings Article | 1 August 2021 Presentation

Simultaneous low-order phase suppression and defect passivation for efficient and stable blue light emitting diodes

Wallace C. Choy

Proceedings Volume 11808, 118080X (2021) https://doi.org/10.1117/12.2595122

KEYWORDS: Perovskite, Blue light emitting diodes, External quantum efficiency, Energy transfer, Light emitting diodes, Energy efficiency, Electroluminescence, Crystals

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Proceedings Article | 18 September 2018 Presentation

Self-assembled quasi-3D nanocomposite as novel p-type hole transport layer for highly performed inverted organic solar cells (Conference Presentation)

Wallace C. Choy

Proceedings Volume 10737, 1073708 (2018) https://doi.org/10.1117/12.2320852

KEYWORDS: Nanocomposites, Organic photovoltaics, Solar cells, Optoelectronics, Organic electronics, P-type semiconductors, Semiconductors, Fullerenes, Lithium

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Proceedings Article | 19 September 2017 Presentation

New low-temperature approach for forming high performance CH3NH3PbI3 solar cells with good productivity and stability (Conference Presentation)

Wallace C. Choy

Proceedings Volume 10363, 103630S (2017) https://doi.org/10.1117/12.2272092

KEYWORDS: Solar cells, Annealing, Nanostructuring, Nanolithography, Chlorine, Process control, Crystals, Fabrication, Photovoltaics

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Proceedings Article | 9 September 2015 Paper

Hysteresis-free, stable and efficient perovskite solar cells achieved by vacuum-treated thermal annealing of CH3NH3PbI3

Fengxian Xie, Di Zhang, Wallace Choy

Proceedings Volume 9567, 95670L (2015) https://doi.org/10.1117/12.2187973

KEYWORDS: Annealing, Solar cells, Crystals, Chlorine, Lead, Photovoltaics, Diffusion, Thin films, Chemical species, Perovskite

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Proceedings Article | 1 September 2015 Paper

New concept to break the intrinsic properties of organic semiconductors for optical sensing applications

Wallace Choy

Proceedings Volume 9608, 96081A (2015) https://doi.org/10.1117/12.2187190

KEYWORDS: Organic semiconductors, Nanostructures, Absorption, Solar cells, Sun, Optical sensing, Electron transport, Organic photovoltaics, Plasmonics, Semiconductors

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Proceedings Article | 27 September 2013 Paper

Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates

Tobias Schwab, Cornelius Fuchs, Reinhard Scholz, XuanHua Li, Fengxian Xie, Wallace Choy, Karl Leo, Malte Gather

Proceedings Volume 8829, 88291I (2013) https://doi.org/10.1117/12.2023222

KEYWORDS: Organic light emitting diodes, Scattering, Light scattering, Waveguides, Photoresist materials, OLED lighting, Waveguide modes, Dispersion, Destructive interference, External quantum efficiency

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Proceedings Article | 13 September 2012 Paper

Theoretical studies of effects of 2D plasmonic grating on electrical properties of organic solar cells

Wei Sha, Wallace Choy, Weng Cho Chew

Proceedings Volume 8477, 847714 (2012) https://doi.org/10.1117/12.929498

KEYWORDS: Plasmonics, Excitons, Organic photovoltaics, Solar cells, Near field optics, Nanostructures, Polymers, Surface plasmons, Physics, Interfaces

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Proceedings Article | 13 September 2012 Paper

Optical properties enhancement in low-bandgap organic solar cells with embedded PEDOT:PSS gratings

Xiaolong Zhu, Chuihui Duan, Wallace Choy, Fengxian Xie, Chuandao Wang, Fei Huang, Yong Cao

Proceedings Volume 8477, 847710 (2012) https://doi.org/10.1117/12.929518

KEYWORDS: Absorption, Reflectivity, Organic photovoltaics, Solar cells, Optical properties, Diffraction gratings, Quantum efficiency, Refractive index, Polymers, Interfaces

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Proceedings Article | 13 September 2012 Paper

PEDOT:PSS-free Au nanocluster treated graphene as transparent anode for organic solar cells

Di Zhang, Wallace Choy, Hongwei Zhu

Proceedings Volume 8477, 84771D (2012) https://doi.org/10.1117/12.929505

KEYWORDS: Graphene, Gold, Organic photovoltaics, Solar cells, Remote sensing, Electrodes, Oxygen, Resistance, Ultraviolet radiation, Interfaces

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Proceedings Article | 13 September 2012 Paper

Mixing plasmonic Au nanoparticles into all polymer layers for improving the efficiency of organic solar cells

Wallace Choy, Charlie Wang, Dixon Fung, Wei Sha, Feng-Xian Xie

Proceedings Volume 8477, 847713 (2012) https://doi.org/10.1117/12.929495

KEYWORDS: Gold, Polymers, Absorption, Organic photovoltaics, Control systems, Nanoparticles, Solar cells, Plasmonics, Resistance, Remote sensing

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Proceedings Article | 16 April 2008 Paper

An effective intermediate Al/Au electrode for stacked color-tunable organic light emitting devices

Tianhang Zheng, Wallace Choy

Proceedings Volume 6999, 69992R (2008) https://doi.org/10.1117/12.779449

KEYWORDS: Organic light emitting diodes, Electrodes, Aluminum, Gold, Electroluminescence, Thin films, Optical microcavities, Excitons, Organic materials, Glasses

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Proceedings Article | 9 October 2005 Paper

Improving the efficiency of OLEDs by utilizing metallophthalocyanines

Wallace C. Choy, Y. J. Liang, K. N. Hui, H. H. Fong

Proceedings Volume 5937, 59371Y (2005) https://doi.org/10.1117/12.617641

KEYWORDS: Organic light emitting diodes, Aluminum, Laser induced fluorescence, Electron transport, Copper, Magnesium, Zinc, Composites, Lithium, Organic materials

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Proceedings Article | 9 October 2005 Paper

Oxadiazole-triphenylamine derivatives for OLEDs

Wallace C. H. Choy, K.N. Hui, Y.J. Liang, K.L. Tong, S.K. So, Louis Leung, N. J. Xiang, Gong Menglian

Proceedings Volume 5937, 59371L (2005) https://doi.org/10.1117/12.616721

KEYWORDS: Absorption, Refractive index, Organic light emitting diodes, Electron transport, Molecules, Calcium, Aluminum, Ellipsometry, Electroluminescence, Optical properties

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Proceedings Article | 9 October 2005 Paper

Device enhancement of hydroxyquinloine-based organic light-emitting diodes using a uniformly mixed electron transporting host

W. C. Choy, H. H. Fong, K. N. Hui, Y. J. Liang

Proceedings Volume 5937, 593721 (2005) https://doi.org/10.1117/12.618103

KEYWORDS: Electron transport, Organic light emitting diodes, Luminous efficiency, Composites, Aluminum, Doping, Laser induced fluorescence, Crystals, Excitons, Quartz

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Proceedings Article | 15 May 2001 Paper

InGaAs/InGaAsP diffused quantum wells optical amplifiers and modulators

Wallace Choy, Jian Jun He, Ming Li, Yan Feng, Emil Koteles

Proceedings Volume 4277, (2001) https://doi.org/10.1117/12.426830

KEYWORDS: Quantum wells, Optical amplifiers, Modulators, Chromium, Absorption, Ion implantation, Modulation, Annealing, Ions, Waveguides

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Proceedings Article | 28 April 1999 Paper

Polarization-insensitive electro-absorption and gain-switching quantum well modulators using interdiffusion

Wallace Choy, E. Herbert Li, Bernard Weiss

Proceedings Volume 3666, (1999) https://doi.org/10.1117/12.347932

KEYWORDS: Quantum wells, Polarization, Absorption, Modulators, Optical components, Optical properties, Diffusion, Optical amplifiers, Electrons, Annealing

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Proceedings Article | 26 March 1999 Paper

Double quantum well phase modulators using surface acoustic waves

Wallace Choy, E. Herbert Li, Bernard Weiss

Proceedings Volume 3620, (1999) https://doi.org/10.1117/12.343756

KEYWORDS: Modulators, Quantum wells, Refractive index, Aluminum, Phase shift keying, Phase modulation, Absorption, Excitons, Modulation, Electro optical modeling

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