Upconversion emission colour modulation of Y2O2S: Yb, Er under 1.55μm and 980nm excitation

Wang, Hong; Xing, Mingming; Zhou, Xu; Fu, Yao; Jiang, Tao; Peng, Yong; Ma, Yunbei; Duan, Xiaolong

doi:10.1016/j.jallcom.2013.10.163

Cited by 51 publications

(23 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Upconversion (UC) processes in which two or more low‐energy photons are combined to obtain one higher energy photon were discovered independently by Auzel and Ovsyankin and Feofilov . The study of UC materials has great importance for applications in different fields such as solid state lasers, bio‐labeling, diagnostics, or efficiency enhancement of solar cells . Particularly, for photovoltaic applications, an UC material located on the back side of a solar cell should efficiently convert transmitted sub‐bandgap photons into high energy photons which can subsequently be absorbed by the solar cell.…”

Section: Introductionmentioning

confidence: 99%

Upconversion Dynamics in Er³⁺‐Doped Gd₂O₂S: Influence of Excitation Power, Er³⁺ Concentration, and Defects

Martín-Rodríguez

Rabouw

Trevisani

et al. 2015

Advanced Optical Materials

View full text Add to dashboard Cite

Upconversion (UC) enables the conversion of lower energy to higher energy photons and has gained interest for the application in solar cells and nanocrystal biolabels. Er3+‐doped Gd2O2S is a highly promising UC material for applications. A record UC quantum yield of 12% was recently measured in Gd2O2S doped with 10% Er3+ upon monochromatic excitation into the 4I13/2 state at 1510 nm for moderate excitation densities (700 W m−2). In this work, the focus is on the dynamics of the infrared (4I13/2, ≈1500 nm) to near‐infrared (4I11/2, ≈1000 nm) UC luminescence in Er3+‐doped Gd2O2S. On the basis of luminescence spectra (emission and excitation), UC emission decay curves, and rate equation modeling, it is shown that energy transfer upconversion (ETU) is the mechanism responsible for the 4I11/2 UC luminescence, and the ETU parameter for Gd2O2S:10%Er3+ is determined to be W ETU = 6.3 × 10−19 cm3 s−1. The UC dynamics depend on the Er3+ concentration and, similar to triplet–triplet annihilation UC in organic materials, on the excitation power. The results highlight the subtle balance between desired energy transfer processes leading to ETU and undesired energy migration to quenching sites. The overall UC efficiency is dependent not only on the material and composition but also on the synthesis process.

show abstract

Section: Introductionmentioning

confidence: 99%

Upconversion Dynamics in Er³⁺‐Doped Gd₂O₂S: Influence of Excitation Power, Er³⁺ Concentration, and Defects

Martín-Rodríguez

Rabouw

Trevisani

et al. 2015

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…[23][24][25][26][27] Previous results show that micron sized rare-earth oxysuldes have very good UCL properties. 28 More importantly, microsized UCL materials with highly luminescence efficiency, colorful emission input, and which are environmentally friendly are required for many practical applications, such as up-conversion X-ray detection, full-color displays, laser anti-counterfeiting and so on.…”

Section: -3mentioning

confidence: 99%

Luminescence property tuning of Yb³⁺-Er³⁺ doped oxysulfide using multiple-band co-excitation

et al. 2018

Self Cite

View full text Add to dashboard Cite

Lanthanide ions have abundant excited-state channels which result in a radiation relaxation process generally accompanied by a non-radiation relaxation process. However, non-radiation relaxation processes will consume the activation energy and reduce the luminescence efficiency of the phosphor.Two lasers with an excitation energy which matched the ground state absorption and excited state absorption of ions were used to excite the phosphors to avoid the non-radiation relaxation process. This approach can achieve the purpose of populating specific states of the lanthanide ions, and furthermore effectively tunes the luminescence intensity and color output of the sample. Results show that the red emission intensity of the sample is significantly improved and this is caused by populating the 4 F 9/2 level under simultaneous 1510 nm and 980 nm excitation. Then when the 1510 nm and 808 nm co-operate to excite the sample, the green emission obtained increased sharply because the 2 H 11/2 / 4 S 3/2 states were efficiently populated. As a proof-of-concept experiment, this new approach has potential in the applications of solar cells.

show abstract

“…First, monodispersed core@shell‐structured NaYF 4 :Yb/Er@NaGdF 4 nanoparticles were prepared by growing a NaGdF 4 shell on NaYF 4 :Yb/Er core according to our previous work . Yb 3+ and Er 3+ were doped into the core to emit visible optical signal under the excitation of 980 nm NIR light . The coated ultrathin NaGdF 4 shell can significantly enhance MRI contrast performance as well as upconversion luminescence intensity.…”

Section: Resultsmentioning

confidence: 99%

Targeting Upconversion Nanoprobes for Magnetic Resonance Imaging of Early Colon Cancer

Jin

Zhang

et al. 2017

Part. Part. Syst. Charact.

View full text Add to dashboard Cite

Colon cancer (CC) is one of the most common intestinal malignancies and is difficult to detect in its early stage by magnetic resonance imaging (MRI) with currently used contrast agents (CAs). The development of targeted CAs contributes to the early diagnosis of CC and thereby enables early intervention and timely therapy. Considering the outstanding performance of upconversion nanoprobes (UCNPs) in high‐performance MR and fluorescence imaging, a new type of nanoprobes with considerably enhanced imaging performance is developed herein. Carcinoembryonic antigen (CEA) antibody is conjugated onto the surface of UCNPs to achieve the targeted imaging of early CC tumors, which overexpress CEA. Both toxicity tests and histological/hematological examinations demonstrate the excellent biocompatibility of these CC‐targeting nanoprobes, which possess great potential for clinical application in the early diagnosis of CC.

show abstract

Upconversion emission colour modulation of Y2O2S: Yb, Er under 1.55μm and 980nm excitation

Cited by 51 publications

References 20 publications

Upconversion Dynamics in Er³⁺‐Doped Gd₂O₂S: Influence of Excitation Power, Er³⁺ Concentration, and Defects

Upconversion Dynamics in Er³⁺‐Doped Gd₂O₂S: Influence of Excitation Power, Er³⁺ Concentration, and Defects

Luminescence property tuning of Yb³⁺-Er³⁺ doped oxysulfide using multiple-band co-excitation

Targeting Upconversion Nanoprobes for Magnetic Resonance Imaging of Early Colon Cancer

Contact Info

Product

Resources

About

Upconversion emission colour modulation of Y2O2S: Yb, Er under 1.55μm and 980nm excitation

Cited by 51 publications

References 20 publications

Upconversion Dynamics in Er3+‐Doped Gd2O2S: Influence of Excitation Power, Er3+ Concentration, and Defects

Upconversion Dynamics in Er3+‐Doped Gd2O2S: Influence of Excitation Power, Er3+ Concentration, and Defects

Luminescence property tuning of Yb3+-Er3+ doped oxysulfide using multiple-band co-excitation

Targeting Upconversion Nanoprobes for Magnetic Resonance Imaging of Early Colon Cancer

Contact Info

Product

Resources

About

Upconversion Dynamics in Er³⁺‐Doped Gd₂O₂S: Influence of Excitation Power, Er³⁺ Concentration, and Defects

Upconversion Dynamics in Er³⁺‐Doped Gd₂O₂S: Influence of Excitation Power, Er³⁺ Concentration, and Defects

Luminescence property tuning of Yb³⁺-Er³⁺ doped oxysulfide using multiple-band co-excitation