Influence of annealing temperature on the upconversion luminescence properties of NaYF4:Er,Yb@SiO2 particles

Sagaydachnaya, Elena A.; Kochubey, Vyacheslav I.; Konyukhova, Julia G.

doi:10.1088/1742-6596/917/3/032006

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…Silica coating can act as a protective layer, preventing particles from aggregating and fusing during the annealing process. 24 Annealed nanophosphors at 400 °C ( Fig. 10A ) showed separate particles with a thin silica coating.…”

Section: Resultsmentioning

confidence: 96%

“…High temperature annealing could enhance luminescence by removing crystal defects, increasing crystal domain size and removing trapped water and carbon dioxide. 23,24 Unfortunately, when we annealed our nanophosphors at temperatures above 700 C, we found that the particles aggregated. For example, Fig.…”

Section: Annealing Nagdf 4 :Eu Nanophosphorsmentioning

confidence: 94%

“…We also compared X-ray excited optical luminescence (XEOL) spectra from hydrothermal and co-precipitation synthesis methods and the effect of thermal annealing. Nanoparticle annealing at high temperature is a widespread method in upconversion nanophosphors to enhance luminescence 10,23,24 by reducing crystal defect, increasing crystal domain size and removing trapped water and carbon dioxide. However, enhancing luminescence of X-ray excited nanophosphors using annealing techniques is still under investigation.…”

Section: Introductionmentioning

confidence: 99%

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X-ray excited luminescence spectroscopy and imaging with NaGdF₄:Eu and Tb

et al. 2021

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Section: Resultsmentioning

confidence: 96%

Section: Annealing Nagdf 4 :Eu Nanophosphorsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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X-ray excited luminescence spectroscopy and imaging with NaGdF₄:Eu and Tb

et al. 2021

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“…Nanoparticles synthesized using the co-precipitate method and coated with silica have low luminescence intensity which minimizes most in vivo applications such as deep tissue imaging and implantable biosensors. High temperature annealing could enhance its luminescence by removing crystal defects, increasing crystal domain size and removing trapped water and carbon dioxide [21,22]. Unfortunately, when we annealed our nanophosphors at temperatures above 700 ºC, we found that the particle aggregated.…”

Section: Annealing Nagdf4: Eu Nanoparticlesmentioning

confidence: 93%

“…However, its luminescence intensity was increased by a factor of ~7 compared to nanoparticles synthesized by the co-precipitate method. Silica coating can act as a protective layer, preventing particles from aggregating and fusing during the annealing process [21]. Annealed nanoparticles at 400 ⁰C ( Figure 8A) showed separate particles with a thin silica coating.…”

Section: Annealing Nagdf4: Eu Nanoparticlesmentioning

confidence: 99%

X-Ray Excited Luminescence Spectroscopy and Imaging with NaGdF4:Eu and Tb

Ranasinghe¹,

Arifuzzaman²,

Rajamanthrilage³

et al. 2020

Preprint

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X-ray scintillating NaGdF4: Eu and Tb nanophosphors were synthesized via co-precipitate and hydrothermal methods, encapsulated with silica, functionalized with biotin, and characterized by X-ray excited optical luminescence spectroscopy and imaging. The nanophosphors synthesized by co-precipitate method were ~90 and ~106 nm in size, respectively; nanophosphors synthesized by hydrothermal method showed the highest luminescence intensity. Further, we investigated the effect of thermal annealing/calcination on the X-ray excited luminescence spectra and intensity. We observed, at high-temperature, NaGdF4: Eu@SiO2 converts to NaGd9Si6O26: Eu which is also an X-ray scintillator. The particles generate light through tissue and can be selectively excited using a focused X-ray source for imaging and light generation applications. The particles also act as MRI contrast agents for multi-modal localization.

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Prospects For Application of Upconversion Particles NaYF4:Er,Yb for Phototherapy

Kochubey¹,

Sagaidachnaya²,

Yanina³

2018

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Кочубей Вячеслав Иванович, доктор физико-математических наук, профессор кафедры оптики и биофотоники, Саратовский национальный исследовательский государственный университет имени Н. Г. Чернышевского; ведущий научный сотрудник междисциплинарной лаборатории биофотоники, Томский национальный исследовательский государственный университет, saratov_gu@mail.ru В работе описан принцип действия функционализированных апконверсионных частиц, позволяющих проводить фотодинамическую и фототермическую терапии опухоли с одновременным контролем температуры и возможностью визуализировать область терапии. Апконверсионные частицы являются перспективным материалом для комплексной фототерапии с одновременным контролем нагрева биоткани, поскольку могут позволить увеличить глубину терапевтического воздействия за счет большой глубины проникновения необходимого возбуждающего излучения. Рассмотрены особенности гидротермального метода синтеза апконверсионных частиц NaYF 4 :Er,Yb, представляющегося наиболее перспективным. Гидротермальный метод позволяет варьировать параметры синтезируемых частиц путем регулировки температуры и времени синтеза, концентрации пассивирующего и фторирующего агентов. При этом могут быть получены частицы различной морфологии от стержней до пластинок различных размеров (10 нм-5 мкм). Последующая функционализация частиц фотосенсибилизатором обеспечивает фотодинамическое действие. Приведен обзор результатов исследований in vitro на маркерных веществах и клетках, подтверждающих эффективность генерации токсических форм кислорода в присутствии функционализированных апконверсионных частиц и их цитотоксического действия. Показано, что использование таких частиц позволяет увеличить глубину действия терапии согласно исследованиям in vivo на мышах, а значит, увеличить ее эффективность и расширить границы применимости. Описанные процессы могут дать основания для развития методов фотодинамической терапии, направленных на расширение области применения и функциональных возможностей терапии. Ключевые слова: фотодинамическая терапия, фототермическая терапия, апконверсионные частицы.

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Influence of annealing temperature on the upconversion luminescence properties of NaYF₄:Er,Yb@SiO₂ particles

Cited by 3 publications

References 8 publications

X-ray excited luminescence spectroscopy and imaging with NaGdF₄:Eu and Tb

X-ray excited luminescence spectroscopy and imaging with NaGdF₄:Eu and Tb

X-Ray Excited Luminescence Spectroscopy and Imaging with NaGdF4:Eu and Tb

Prospects For Application of Upconversion Particles NaYF4:Er,Yb for Phototherapy

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Influence of annealing temperature on the upconversion luminescence properties of NaYF4:Er,Yb@SiO2 particles

Cited by 3 publications

References 8 publications

X-ray excited luminescence spectroscopy and imaging with NaGdF4:Eu and Tb

X-ray excited luminescence spectroscopy and imaging with NaGdF4:Eu and Tb

X-Ray Excited Luminescence Spectroscopy and Imaging with NaGdF4:Eu and Tb

Prospects For Application of Upconversion Particles NaYF4:Er,Yb for Phototherapy

Contact Info

Product

Resources

About

Influence of annealing temperature on the upconversion luminescence properties of NaYF₄:Er,Yb@SiO₂ particles

X-ray excited luminescence spectroscopy and imaging with NaGdF₄:Eu and Tb

X-ray excited luminescence spectroscopy and imaging with NaGdF₄:Eu and Tb