Results 51 to 60 of about 3,884 (187)

Super-Quadratic Upconversion Luminescence among Lanthanide Ions

2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2019
We explore the arguably most fundamental aspect of energy-transfer upconversion (ETU), namely the dependence of upconversion luminescence from a higher-energy level, following ETU excitation from a metastable lower-energy level, on direct luminescence from that metastable level. We investigate ETU among neighboring Nd3+ ions in single crystals of GdVO4
Carrasco I, Laversenne L, Bigotta S, Toncelli A, Tonelli M, Zagumennyi AI, Pollnau M   +6 more
openaire   +5 more sources

Machine‐Learning‐Assisted Onset‐Time Determination in Transient Luminescence Thermometry

Advanced Intelligent Discovery, EarlyView.
Artificial neural networks enable autonomous extraction of onset times from transient heating curves in luminescence thermometry. Using Ln3+‐doped upconverting nanoparticles as luminescent thermometers, we combine experimental transients with physically motivated synthetic curves to enhance data diversity and improve generalization.
David J. Sousa, Erving Ximendes, Luís D. Carlos, Carlos D. S. Brites   +3 more
wiley   +1 more source

Near-infrared-triggered photon upconversion tuning in all-inorganic cesium lead halide perovskite quantum dots

Nature Communications, 2018
Optimizing luminescence from quantum dots benefits various optoelectronic and photovoltaic applications. Here the authors drive high-efficiency, tunable upconversion luminescence in perovskite quantum dots by energy transfer from lanthanide-doped ...
Wei Zheng, Ping Huang, Zhongliang Gong, Datao Tu, Jin Xu, Qilin Zou, Renfu Li, Wenwu You, Jean-Claude G. Bünzli, Xueyuan Chen   +9 more
doaj   +1 more source

Thermometric Based‐Microswimmers with Chemical and Optical Engines

Advanced Intelligent Systems, EarlyView.
Temperature sensing at small scales is typically performed using passive luminescent particles. Here, an alternative approach is demonstrated by integrating upconversion thermometry into self‐propelled microswimmers powered by chemical fuels or light. This strategy offers a step toward dynamic thermal sensing at the microscale, relevant to both lab‐on ...
João M. Gonçalves, Katherine Villa
wiley   +1 more source

Anti-thermal quenching upconversion luminescence of Cr3+ in Sc2(WO4)3:Yb/Cr

Nano Research
Although widely need from various applications, the luminescence of Cr3+ is easily prone to thermal quenching (TQ), causing remarkable intensity reduction as temperature rises, and posing a significant constraint in applications such as high-power ...
Yang Wei, Shuaihao Wu, Ran Chen, Chao Sun, Feng Wang, Xinru Ding, Hui Wang, Yanqing Lu, Ling Huang   +8 more
doaj   +1 more source

Real‐time biosensing of Parkinson's disease biomarkers via NIR‐activated upconversion nanoparticles

BMEMat, EarlyView.
Schematic illustration of the luminescence resonance energy transfer‐driven core‐shell‐shell UCNPs (cssUCNPs@Fluo4) nanoprobe for simultaneous monitoring of Ca²⁺‐temperature dynamics in Parkinson's disease models. Abstract Parkinson's disease (PD) is a progressive neurodegenerative disorder with incompletely understood pathophysiology, necessitating ...
Jialin Liu, Nan Li, Yu Chen, Rui Pu, Wei Wei, Yunqi Lin, Lejing Li, Yao Lu, Jianhua Hao, Lihua Li   +9 more
wiley   +1 more source

Magnetic and fluorescent Gd2O3:Yb3+/Ln3+ nanoparticles for simultaneous upconversion luminescence/MR dual modal imaging and NIR-induced photodynamic therapy

International Journal of Nanomedicine, 2016
Jun Liu,1,* Long Huang,2,3,* Xiumei Tian,4 Xiaoming Chen,4 Yuanzhi Shao,5 Fukang Xie,3 Dihu Chen,1 Li Li21School of Electronics and Information Technology and School of Physics, 2State Key Laboratory of Oncology in South China, Imaging Diagnosis and ...
Liu J, Huang L, Tian XM, Chen XM, Shao YZ, Xie FK, Chen DH, Li L   +7 more
doaj  

Asymmetric Diphosphane Dioxides With A–π–A–π’–D Scaffolds for High‐Purity Deep‐Blue Luminescence

Chemistry – A European Journal, EarlyView.
Diphosphane dioxide‐based luminophores with donor–π–acceptor– π’–acceptor scaffold enable efficient deep‐blue emission from tunable charge‐transfer states affording high photoluminescence up to 95%. OLEDs reach EQE 4.9%, aided by triplet–triplet annihilation, highlighting a practical route to high‐performance blue emitters.
Eetu Hakkarainen, Zong‐Ying Liu, Jhon Sebastian Oviedo Ortiz, Nicolas Vanthuyne, Jeanne Crassous, Ondřej Mrózek, Fabien B. L. Cougnon, Wen‐Yi Hung, Pi‐Tai Chou, Igor O. Koshevoy, Andrey Belyaev   +10 more
wiley   +1 more source

Integrated Solvent‐Catalyst‐Dopant Strategy via Acidic DES for Synthesizing Lignin‐Derived Carbon Dots With High‐Quantum Yield to Achieve Efficient Photocatalytic Degradation of Tetracycline

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A deep eutectic solvent (ChCl/pTSA) platform enables integrated solvent, catalyst, and dopant functions, producing sulfur‐doped carbon quantum dots with a high sp2‐C content (82.8%) and a quantum yield of 56.9%. When combined with TiO2, the CQDs form TiOC and TiOS interfacial bridges, achieving 97.3% tetracycline photodegradation with excellent ...
Xinhang Li, Haipeng Guo, Suen Hou, Fenghua Huang, Hailong Yu   +4 more
wiley   +1 more source

Luminescence and upconversion from thulium(iii) species in solution

Physical Chemistry Chemical Physics, 2012
Thulium salts and complexes are shown to be emissive from three states in the excited state manifold of Tm(3+). Formation of the (1)D(2) state can result in luminescence, or in energy transfer to the lower energy (1)G(4) and (3)H(4) emissive states.
Blackburn, Octavia A., Tropiano, Manuel, Sørensen, Thomas Just, Thom, James, Beeby, Andrew, Bushby, Lisa M., Parker, David, Natrajan, Louise S., Faulkner, Stephen   +8 more
openaire   +5 more sources