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Structurally engineered colloidal quantum dot phosphor using TiO_(2) photonic crystal backbone

Light(Science & Applications) 2022年第11期11卷 2782-2789页

作者： Hansol Lee Tae-Yun Lee Yeonsang Park Kyung-Sang Cho Young-Geun Rho hyuck choo Heonsu Jeon Department of Physics and Astronomy Seoul National UniversitySeoul 08826Republic of Korea Inter-university Semiconductor Research Center Seoul National UniversitySeoul 08826Republic of Korea Department of Physics Chungnam National UniversityDaejeon 34134Republic of Korea Institute of Quantum Systems Chungnam National UniversityDaejeon 34134Republic of Korea Samsung Advanced Institute of Technology Suwon 16678Republic of Korea Institute of Applied Physics Seoul National UniversitySeoul 08826Republic of Korea

Photonic crystal(PhC)phosphor,in which the phosphor material is periodically modulated for an enhancement in color-conversion efficiency via resonant absorption of excitation photons,is a paradigm-shifting structural phosphor ***-dimensional(2D)square-lattice PhC phosphor is currently considered the most advanced platform because of not only its high efficiency,but also its immunity to excitation *** the present study,two major modifications are made to further improve the performance of the 2D PhC phosphor:increasing the refractive index contrast and planarizing the *** index contrast is improved by replacing the PhC backbone material with TiO_(2)whereas the surface planarization is achieved by removing excessive colloidal quantum dots from the *** comparison with the reference phosphor,the upgraded PhC phosphor exhibits~59 times enhanced absorption(in simulations)and~7 times enhanced emission(in experiments),both of which are unprecedentedly *** results not only brighten the viability and applicability of the PhC phosphor but also spur the phosphor development through structural engineering of phosphor materials.

关键词： immunity phosphor backbone

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A microscale optical implant for continuous in vivo monitoring of intraocular pressure

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Microsystems & Nanoengineering 2017年第1期3卷 11-19页

作者： Jeong Oen Lee Haeri Park Juan Du Ashwin Balakrishna Oliver Chen David Sretavan hyuck choo Department of Medical Engineering California Institute of TechnologyPasadenaCA 91106USA Department of Electrical Engineering California Institute of TechnologyPasadenaCA 91106USA Department of Ophthalmology University of California San FranciscoSan FranciscoCA 94143USA Department of Physiology University of California San FranciscoSan FranciscoCA 94143USA

Intraocular pressure(IOP)is a key clinical parameter in glaucoma ***,despite the potential utility of daily measurements of IOP in the context of disease management,the necessary tools are currently lacking,and IOP is typically measured only a few times a *** we report on a microscale implantable sensor that could provide convenient,accurate,ondemand IOP monitoring in the home *** excited by broadband near-infrared(NIR)light from a tungsten bulb,the sensor’s optical cavity reflects a pressure-dependent resonance signature that can be converted to *** light is minimally absorbed by tissue and is not perceived *** sensor’s nanodot-enhanced cavity allows for a 3–5 cm readout distance with an average accuracy of 0.29 mm Hg over the range of 0–40 mm *** were mounted onto intraocular lenses or silicone haptics and secured inside the anterior chamber in New Zealand white *** sensors provided continuous in vivo tracking of short-term transient IOP elevations and provided continuous measurements of IOP for up to 4.5 months.

关键词： glaucoma intraocular pressure(IOP) microscale sensor implant in vivo continuous monitoring remote optical readout near-infrared(NIR)broadband light minimally invasive

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