Tuning the NIR downconversion luminescence and photothermal conversion efficiencies of MNdx Y1-x F4 (M = Na and Li) nanocrystals for use in anti-counterfeiting labels with opposite displays

Nanoscale
Xiangyang Wu, Edwin K L Yeow

Abstract

Rare earth (RE3+ = Y3+ and Nd3+) alkali (M+ = Na+ or Li+) tetrafluoride nanocrystals adopt various morphologies and crystal structures depending on the M+-RE3+ size compatibility and Nd3+ concentration. This in turn affects the downconversion NIR luminescence and photothermal properties of the nanocrystals. For NaOH precursor, hexagonal NaNdxY1-xF4 nanocrystals are formed from the initially created cubic NaNdxY1-xF4 nanocrystals, whereas for LiOH precursor, tetragonal LiNd0.03Y0.97F4 nanocrystals are obtained. Due to the large size mismatch between Li+ and Nd3+, unstable LiNdxY1-xF4 undergoes phase separation to form either orthorhombic or hexagonal NdxY1-xF3 nanocrystals upon increasing the Nd3+ concentration. The latter dominates when Nd3+ is the majority rare earth element in the host matrix. NaNdxY1-xF4 nanocrystals display better luminescence and photothermal properties as compared to their Li+-based counterparts and the inverse relationship between emission and light-to-heat conversion efficiencies is exploited for anti-counterfeiting purposes. In this case, patterns deposited on different substrates (e.g., glass and Teflon) using Nd3+-concentrated nanocrystals, with efficient light-to-heat conversion and poor NIR lumines...Continue Reading

References

Oct 8, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Ya-Ping DuChun-Hua Yan
May 11, 2011·Nano Letters·Colin M HesselBrian A Korgel
Sep 17, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Qingqing Dou, Yong Zhang
Dec 15, 2016·Chemical Society Reviews·Xingjun ZhuFuyou Li
Jul 7, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Xiuwen WangWei Huang
Jan 31, 2018·ACS Applied Materials & Interfaces·Hongki KangYoonkey Nam
Aug 17, 2018·Journal of the American Chemical Society·Ghulam JalaniMarta Cerruti
Jan 7, 2016·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Xinyi JiangFuyou Li

❮ Previous
Next ❯

Methods Mentioned

BETA
irradiating
X-ray
transmission

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.