Results 61 to 70 of about 19,577 (268)
Upconversion Nanomaterials: Synthesis, Mechanism, and Applications in Sensing
Sensors, 2012 Upconversion is an optical process that involves the conversion of lower-energy photons into higher-energy photons. It has been extensively studied since mid-1960s and widely applied in optical devices. Over the past decade, high-quality rare earth-doped
Julia Xiaojun Zhao, Jiao Chen
doaj +1 more source
Advanced Materials, EarlyView.We report a multifunctional tapered optical fiber integrating a conformal micro‐resistance temperature detector (µRTD) for local, real‐time thermometry during optical stimulation. The platform combines light‐delivery and temperature sensing within a minimally invasive footprint, enabling detection of sub‐degree cortical heating under representative ...
Antonio Balena +6 more
wiley +1 more source
Uniaxial Strain Tuning of Upconversion Photoluminescence in Monolayer WSe2
Advanced Photonics ResearchStrain engineering is one of the leading mechanical ways to tune the optical properties of monolayer transition metal dichalcogenides among different techniques.
Shrawan Roy, Xiaodong Yang, Jie Gao
doaj +1 more source
Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles
Nanomaterials, 2022 We report the procedure for hydrothermal synthesis of ultrasmall Yb3+/Tm3+ co-doped Sr2LaF7 (SLF) upconversion phosphors. These phosphors were synthesized by varying the concentrations of Yb3+ (x = 10, 15, 20, and 25 mol%) and Tm3+ (y = 0.75, 1, 2, and 3
Bojana Milićević +9 more
doaj +1 more source
All‐Optical Reconfigurable Physical Unclonable Function for Sustainable Security
Advanced Materials, EarlyView.An all‐optical reconfigurable physical unclonable function (PUF) is demonstrated using plasmonic coupling–induced sintering of optically trapped gold nanoparticles, where Brownian motion serves as a robust entropy source. The resulting optical PUF exhibits high encoding density, strong resistance to modeling attacks, and practical authentication ...
Jang‐Kyun Kwak +4 more
wiley +1 more source
Comparison of Quantum Yield of Upconversion Nanocrystals Determined by Absolute and Relative Methods
Advanced Photonics Research, 2023 Photoluminescence quantum yield (ϕ) is a key parameter of any luminescent material. There are two main ways to determine this value: 1) absolute, which requires calculation of the number of emitted and absorbed photons; and 2) relative, which utilizes ...
Eduard Madirov +10 more
doaj +1 more source
Nanomaterials, 2022 Upconversion materials capable of converting low-energy excitation photons into high-energy emission photons have attracted considerable interest in recent years.
Dongyu Li +8 more
doaj +1 more source
Photophysics of Upconversion: Towards Application in Upconversion Displays
, 2020 Der Regenbogen besteht aus sieben Farben. Von Violett nach Rot, nimmt die Photonenenergie des Lichts ab. Durch die Kombination der Energien von zwei roten Photonen kann ein blaues Photon erzeugt werden. Ein solcher Prozess wird als Upconversion (UC) bezeichnet. UC kann in organischen und anorganischen Systemen beobachtet werden.
openaire +2 more sources
Phase Engineering of Atomically Precise Nanoclusters (APNCs) of Gold and Beyond
Advanced Materials, EarlyView.Engineering the structural phase of materials is of paramount importance for both fundamental research and practical applications. In this Review, we summarize the recent progress in controlling the phases of atomically precise nanoclusters (APNCs) of gold, silver and copper, as well as bimetallic systems. The phase‐enabled material properties of APNCs
Yitong Wang +4 more
wiley +1 more source
Blue upconversion thulium laser [PDF]
, 1990 Upconversion has been an active area of research for at least two decades, mainly because of its wide ranging applications from infrared quantum counters, visible-emitting phosphors, to upconversion lasers.
Nguyen, D. C. +7 more
core +1 more source