High upconversion quantum yield at low pump threshold in Er3+/Yb3+ doped La2O2S phosphor

Pokhrel, Madhab; Gangadharan, Ajith Kumar; Sardar, Dhiraj K.

doi:10.1016/j.matlet.2013.02.062

Cited by 74 publications

(51 citation statements)

References 11 publications

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“…[1][2][3][4] Recently there has been a great amount of interest in the derivative structures, such as A 2 B 2 O 7 , of dioxide BO 2 (e.g. B = Zr, Ce, and Hf) type compounds as RE host materials due to their binary metal cation sites, where the larger A site cation can be replaced with trivalent RE ions and B is a smaller transition metal cation.…”

Section: Introductionmentioning

confidence: 99%

Systematic Studies on RE₂Hf₂O₇:5%Eu³⁺ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE³⁺ Cation and Calcination on Structure and Photoluminescence

2016

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A series of 5mol% Eu 3+ doped rare earth (RE) hafnium oxide RE 2 Hf 2 O 7 (RE = Y, La, Pr, Gd, Er, and Lu) nanoparticles (NPs) have been synthesized, calcinated, and systematically investigated using X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and optically excited luminescence. Effects of the A-site RE 3+ cation and calcination on the crystal structure of the RE 2 Hf 2 O 7 :5%Eu NPs were distinguished using XRD and Raman studies.Spectroscopic analysis showed that the La 2 Hf 2 O 7 :5%Eu 3+ and Pr 2 Hf 2 O 7 :5%Eu 3+ possessed ordered pyrochlore structures while the RE 2 Hf 2 O 7 :5%Eu 3+ compositions (RE = Y, Er, and Lu) possessed disordered fluorite structure and were thermodynamically stable up to the highest calcination temperature employed in this study (1500°C). However, a disordered-ordered transition observed in the Gd 2 Hf 2 O 7 :5%Eu 3+ composition indicated that it was not thermodynamically stable. Detailed photoluminescence (PL) studies, including quantum yield and decay properties of each sample before and after calcination, were performed and correlated with their compositions and crystal structures. These results suggest that the A site RE 3+ cations and calcination of these RE 2 Hf 2 O 7 :5%Eu NPs play important roles in their PL properties.

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Section: Introductionmentioning

confidence: 99%

Systematic Studies on RE₂Hf₂O₇:5%Eu³⁺ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE³⁺ Cation and Calcination on Structure and Photoluminescence

2016

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“…To determine the quantum yield (QY) of the NGL, an integrating sphere was calibrated with a material of known efficiency, and identical measurements were done following the standard reported procedure [29,30]. The QY was measured for different Nd concentrations and the results are plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The LLG collects the light from the sphere and feeds to the InGAS detector through the emission monochromator. More details regarding the QY can be seen in our previous publications [29,30]. …”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of Na(Gd0.5Lu0.5)F4: Nd3+,a core-shell free multifunctional contrast agent

Mimun

Ajithkumar

Rightsell

et al. 2017

Journal of Alloys and Compounds

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Compared to conventional core-shell structures, core-shell free nanoparticles with multiple functionalities offer several advantages such as minimal synthetic complexity and low production cost. In this paper, we present the synthesis and characterization of Nd3+ doped Na(Gd0.5Lu0.5)F4 as a core-shell free nanoparticle system with three functionalities. Nanocrystals with 20 nm diameter, high crystallinity and a narrow particle size distributions were synthesized by the solvothermal method and characterized by various analytical techniques to understand their phase and morphology. Fluorescence characteristics under near infrared (NIR) excitation at 808 nm as well as X-ray excitation were studied to explore their potential in NIR optical and X-ray imaging. At 1.0 mol% Nd concentration, we observed a quantum yield of 25% at 1064 nm emission with 13 W/cm2 excitation power density which is sufficiently enough for imaging applications. Under 130 kVp (5 mA) power of X-ray excitation, Nd3+ doped Na(Gd0.5Lu0.5)F4 shows the characteristic emission bands of Gd3+ and Nd3+ with the strongest emission peak at 1064 nm due to Nd3+. Furthermore, magnetization measurements show that the nanocrystals are paramagnetic in nature with a calculated magnetic moment per particle of ~570 μB at 2T. These preliminary results support the suitability of the present nanophosphor as a multimodal contrast agent with three imaging features viz. optical, magnetic and X-ray.

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“…17,22,23 On the other hand, it is well known that the local symmetry restriction around rare earth ions leads to a relative weak UC emitted from a material doped only with Er 3+ . 28 The biggest hindrance of using UC thin film is its low luminescent efficiency compared to those in powder and bulk counterparts. Yb 3+ ion (with only emission at 1000 nm from the 2 F 5/2 → 2 F 7/2 transition) has a much greater absorption cross section and a broader absorption band in comparison with the Er 3+ ion under the excitation of 980 nm photons, leading to a very high Yb-Er energy transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient NIR to visible upconversion in a ZnO:Er,Yb thin film deposited by a AACVD atmospheric pressure process

2015

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High upconversion quantum yield at low pump threshold in Er3+/Yb3+ doped La2O2S phosphor

Cited by 74 publications

References 11 publications

Systematic Studies on RE₂Hf₂O₇:5%Eu³⁺ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE³⁺ Cation and Calcination on Structure and Photoluminescence

Systematic Studies on RE₂Hf₂O₇:5%Eu³⁺ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE³⁺ Cation and Calcination on Structure and Photoluminescence

Synthesis and characterization of Na(Gd0.5Lu0.5)F4: Nd3+,a core-shell free multifunctional contrast agent

Highly efficient NIR to visible upconversion in a ZnO:Er,Yb thin film deposited by a AACVD atmospheric pressure process

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High upconversion quantum yield at low pump threshold in Er3+/Yb3+ doped La2O2S phosphor

Cited by 74 publications

References 11 publications

Systematic Studies on RE2Hf2O7:5%Eu3+ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE3+ Cation and Calcination on Structure and Photoluminescence

Systematic Studies on RE2Hf2O7:5%Eu3+ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE3+ Cation and Calcination on Structure and Photoluminescence

Synthesis and characterization of Na(Gd0.5Lu0.5)F4: Nd3+,a core-shell free multifunctional contrast agent

Highly efficient NIR to visible upconversion in a ZnO:Er,Yb thin film deposited by a AACVD atmospheric pressure process

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Systematic Studies on RE₂Hf₂O₇:5%Eu³⁺ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE³⁺ Cation and Calcination on Structure and Photoluminescence

Systematic Studies on RE₂Hf₂O₇:5%Eu³⁺ (RE = Y, La, Pr, Gd, Er, and Lu) Nanoparticles: Effects of the A-Site RE³⁺ Cation and Calcination on Structure and Photoluminescence