Neodymium doped yttrium aluminate synthesis and optical properties – A blue light emitting nanophosphor and its use in advanced forensic analysis

Darshan, G.P.; Premkumar, H.B.; Nagabhushana, H.; Sharma, Saurabh; Prasad, B. Daruka; Prashantha, S.C.

doi:10.1016/j.dyepig.2016.06.029

Cited by 67 publications

(4 citation statements)

References 41 publications

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“…It was observed that 4 F 9/2 → 6 H 13/2 transition of Dy 3+ doped Bi 2 O 3 NPs dominates the intensity emitted by the NPs in the emission spectra. The results infer that the current NPs can be utilized for white light emitting display devices [49]. Figure 10a shows the Commission International De I'E´ clairage (CIE) chromaticity coordinates for Bi 2 O 3 :Dy 3+ (1-11 mol%) NPs.…”

Section: Resultsmentioning

confidence: 94%

Bi2O3:Dy3+ nanophosphors: its white light emission and photocatalytic activity

Sawant¹,

Prashantha²,

Naik³

et al. 2019

SN Appl. Sci.

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The present work involves the synthesis, characterization, photoluminescence and photocatalytic studies of Dy 3+ (1-11 mol%) doped Bi 2 O 3 nanophosphors (NPs) by solution combustion method. The average crystallite size was determined using powder X-ray diffraction, found to be in the range of 15-30 nm. Scanning electron microscopy images shows that the synthesised product is porous and agglomerated. Kubelka-Munk function was used to assess the energy gap of Dy 3+ doped Bi 2 O 3 nanophosphors and it was found to be 2.53-3.00 eV. From the emission spectra, Judd-Ofelt parameters (Ω 2 and Ω 4 ), transition probabilities (A T ), quantum efficiency (η), luminescence lifetime (τ r ), color chromaticity coordinates (CIE) and correlated color temperature values were estimated and discussed in detail. The CIE chromaticity co-ordinates were close to the National Television Standard Committee standard value of white emission. Using Langmuir-Hinshelwood model, the photocatalytic activity results of Acid Red-88 showed, Bi 2 O 3 :Dy 3+ NPs were potential material for the development of efficient photocatalyst for environmental remediation. The obtained results prove that the Bi 2 O 3 :Dy 3+ NPs synthesised by this method can be potentially used for solid state display and photocatalyst.

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Section: Resultsmentioning

confidence: 94%

Bi2O3:Dy3+ nanophosphors: its white light emission and photocatalytic activity

Sawant¹,

Prashantha²,

Naik³

et al. 2019

SN Appl. Sci.

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“…The same was observed for the negative control without Nd 3+ ions (pure NaYF matrix). This is explained by the close match between the ionic radius of Nd 3+ ( r 3+ =1.123 Å) and Y 3+ ( r 3+ =1.040 Å), preventing significant changes in the crystal structure by doping 31,32 . The addition of the NaYF 4 shell led to a significant (∼25%) size increase of ∼ 9 nm (shell thickness = 4.5 nm) (Fig.…”

Section: Resultsmentioning

confidence: 98%

Neodymium-Doped Nanocrystals for Diffraction-limitedin vitroTemperature Sensing

Bravo,

Yang,

Wen

et al. 2024

Preprint

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Localized hyperthermia is a promising approach to cancer therapy. However, its clinical potential is limited by heterogeneous heat distribution within tumors, and improved methods to measure temperature at the sub-micron level are required. To address this challenge, luminescent nanothermometers, such as lanthanide-doped nanocrystals (Ln-NC) operating in the near-infrared (NIR), have been investigated for accurate spatiotemporal thermal monitoring. In this study, the synthesis of neodymium-doped, sodium yttrium fluoride nanocrystals (NaYF4) was optimized to achieve high photoluminescence (PL) under NIR irradiation by adjusting the dopant concentration and by shelling with inert layers. Standard curves for luminescence-based temperature readout were developed using ratiometric analysis of the temperature-dependent PL spectra in the 850-920 nm biological window. A silica shell was added to the particles and shown to confer excellent aqueous stability and cellular uptake in A549 lung cancer cells, with cell viability maintained >85% when incubated with up to 50 ug/ml of the silica-shelled particles over 6 hours. Finally, luminescent thermal readout was demonstrated in vitro in A549 cells by spectrally resolving the diffraction-limited luminescence spots from single particles over a clinically relevant temperature range from 20-50 C. The demonstration of biocompatible, nanoscale, NIR thermometry in cells is a significant step in the development of viable hyperthermal cancer treatments.

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“…Nesse contexto, inúmeros pesquisadores se dedicam ao desenvolvimento de novas tecnologias e na otimização dos métodos existentes objetivando melhores soluções às questões que os peritos criminais se deparam durante a investigação forense (Darshan et al, 2016;Prasad et al, 2020;Rawtani et al, 2019). Na Tabela 1 está esquematizado os principais produtos comerciais empregados na revelação de impressão digital, bem como as superfícies e as suas principais vantagens e desvantagens.…”

Section: Métodos Usuais De Identificação De Sangue Em Diferentes Supe...unclassified

Marcadores forenses para revelação de digital com sangue: uma breve revisão

Araújo¹,

Souza

Vieira

et al. 2022

RSD

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O desenvolvimento de materiais luminescentes tem sido de extrema relevância no campo de estudo das ciências forenses, devido as contribuições significativas na melhoria da revelação de impressão digital latente, qualidade das imagens e na detecção de inúmeros vestígios em cenas de crimes. Neste sentido, o presente artigo visa realizar uma revisão acerca dos métodos utilizados e os materiais com propriedades luminescentes promissores para aplicação em marcadores forenses para revelação de impressão digital com sangue em diferentes superfícies. Além disso, analisaremos o desenvolvimento de novas tecnologias e a otimização dos métodos existentes com o objetivo de encontrar melhores soluções às questões que os peritos criminais enfrentam durante a investigação forense, tais como o aprimoramento de fatores como toxicidade, sensibilidade, superfície, eficiência dos materiais e dos métodos de revelação, com o uso de abordagens baseadas em materiais fluorescentes como nanopartículas dopadas com terra-raras, 1,8-diazafluoren-9-ona, corantes ácidos e ninidrina. Portanto, verificou-se que mais pesquisas são necessárias para entender melhor o mecanismo de reação envolvido desses materiais, bem como desenvolvimento de novos materiais eficientes, com baixa toxicidade e mais sensíveis para o processamento de impressão digital latentes em diferentes superfícies.

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Neodymium doped yttrium aluminate synthesis and optical properties – A blue light emitting nanophosphor and its use in advanced forensic analysis

Cited by 67 publications

References 41 publications

Bi2O3:Dy3+ nanophosphors: its white light emission and photocatalytic activity

Bi2O3:Dy3+ nanophosphors: its white light emission and photocatalytic activity

Neodymium-Doped Nanocrystals for Diffraction-limitedin vitroTemperature Sensing

Marcadores forenses para revelação de digital com sangue: uma breve revisão

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