Bright white up-conversion emission from sol–gel derived Yb3+/Er3+/Tm3+: Y2SiO5 nanocrystalline powders

Erdem, Murat; Erguzel, Olgun; Ekmekçi, Mete Kaan; Örücü, Hümeyra; Cinkaya, Hatun; Genç, Seval; Mergen, A.; Eryürek, Gönül; Bartolo, Baldassare Di

doi:10.1016/j.ceramint.2015.06.116

Cited by 32 publications

(14 citation statements)

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“…To understand the photocatalytic mechanism, it is better knowing the mechanism of upconversion, which was described as follows. In the RE ions systems, Yb 3+ ion acted as the sensitizer and Tm 3+ ion was the activator . Yb 3+ ions excited from the ground state 2 F 7/2 to the excited state 2 F 5/2 when absorbing a photon.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm³⁺/Yb³⁺ Co–Doped Bi_3.64Mo_0.36O_6.55

et al. 2019

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A novel photocatalyst of Bi3.64Mo0.36O6.55 doped with Tm3+/Yb3+ was prepared by a simple coprecipitation method followed by a calcination technology. The as‐synthesized Tm3+/Yb3+‐Bi3.64Mo0.36O6.55 samples were characterized by various analytical methods. The as‐synthesized sample exhibited enhanced photocatalytic activity when degrading Rhodamine B under the irradiation of visible‐light. The photocatalytic degradation efficiency of Tm3+/Yb3+‐Bi3.64Mo0.36O6.55 (95.2%) was higher than that of pure Bi3.64Mo0.36O6.55 (85.2%) in 50 min. Besides, the sample revealed a stable photocatalytic property after four photodegradation cycles. Therefore, this study may provide a better method to obtain stable upconversion photocatalyst degrading organic pollution with greatly improved activity.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm³⁺/Yb³⁺ Co–Doped Bi_3.64Mo_0.36O_6.55

et al. 2019

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“…Emission spectra of Li 1-x Yb x P 4 O 12 nano-crystals reported on by Marciniak et al 21 show no evidence of such thermal emission between 1-1.8 μm. Wang et al 24 also show emission spectra in Er 2 O 3 in the 1100-1700 nm region under 975 nm pumping, in which the main emission is from Er near 1500 nm, and only a weak broadband emission is observed.…”

Section: Discussionmentioning

confidence: 99%

“…Er 2 O 3 , Y 2 O 3 , Yb 2 O 3 ), the log-log plots of emission intensity vs. power show a transition from a steep slope to a shallower slope as the pumping intensity increases, indicating an increase in white light efficiency once a certain threshold is reached. (3) An interesting experiment performed by Marciniak et al 21 used rare-earth-doped nanoparticles as thermometers to measure the temperature of the material under intense excitation conditions and while emitting the broadband white light. Their results indicated that the temperature of the material was on the order of 900 K, though the temperature associated with the emission (as measured with a thermal camera) was much higher.…”

Section: Discussionmentioning

confidence: 99%

“…One method of recent interest is the upconversion process in rare earth doped systems that depend on energy transfer and/or excited state absorption to produce emission of high-energy photons. Usually, this occurs in systems co-doped with, for example, Yb, Er and Tm, 20,21 and the emission is exclusively from the f-f transitions of the dopant ions. The white light reported on here is generated in a fundamentally different way.…”

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confidence: 99%

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Broadband, White Light Emission from Doped and Undoped Insulators

Tabanli

Cinkaya

Bílír

et al. 2017

ECS J. Solid State Sci. Technol.

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We present data on broadband, white light emission from insulating hosts under intense excitation in the near infrared in host materials that are undoped, partially-doped with rare earth ions, and that contain stoichiometric concentrations of rare earth ions. Much of the emission is found to have a blackbody-like structure in the visible and near infrared region. The origin of the emission as from a blackbody is also supported by the temporal characteristics of the emission in response to turning on and off the laser, and also by the dependence of the air pressure in the chamber. However, some of the data presented cannot be explained by blackbody emission alone, so other processes are proposed to explain the observed spectra. The role of the rare earth ion dopants in enhancing the broadband emission is also considered. Over the last several years, numerous works have reported a broadband, white-light emission from insulating powders under intense, near infrared (IR) excitation. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The materials investigated are usually nano-powders of insulators, such as yttrium oxide, yttrium silicate, Al 2 O 3 , GGG, and others, either pure or doped with rare earth ions (e.g. Er, Nd, Yb, Tm) or transition metal ions (e.g. Cr). Spectral and temporal characteristics of the broadband emission suggest that it is thermal in origin. One study on the origin of the emission, conducted by Debasu et al.,16 concluded that the emission is indeed blackbody emission, with temperatures in the range of ∼1200 K-1900 K. We have studied the white-light emission phenomenon in several host materials, both doped and undoped. In this work, we present results representative of this body of work, and we consider how these results fit into the blackbody model.For lighting applications, one of the main goals is the generation of high quality, white light with highest possible efficiency. Broadband white light based on blackbody-like emission can be of very high quality, but it is never efficient, especially compared to compact fluorescent or LED-based lighting. The white light we report on here is probably no different in that regard, and so it likely will be of little usefulness as a general lighting source. One difference between these emitters and tungsten-based blackbody sources is the means by which energy is delivered to the system; the energy source is a near infrared diode laser instead of electrical power converted to Joule heating, as in a tungsten lamp.Production of white light using near IR photons can occur in different ways. One method of recent interest is the upconversion process in rare earth doped systems that depend on energy transfer and/or excited state absorption to produce emission of high-energy photons. Usually, this occurs in systems co-doped with, for example, Yb, Er and Tm, 20,21 and the emission is exclusively from the f-f transitions of the dopant ions. The white light reported on here is generated in a fundamentally different way. The energy contained in the...

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“…To detail, WL emission was demonstrated in the following nanoscale-sized materials: Cr-doped Gd 3 Ga 5 O 12 (GGG) nano-powders excited by a continuous wave (CW) laser diode emitting at 803.5 nm [18],nominally un-doped yttrium oxide (Y 2 O 3 ) and Nd-doped (up to 20%) Y 2 O 3 nano-powders excited by a CW laser diode emitting at 803.5 and 975nm [17,19,138],yttrium silicate (γ-Y 2 Si 2 O 7 ) and Yb 3+ /Er 3+ /Tm 3+ triply-doped Y 2 Si 2 O 7 nano-powders excited by a CW laser diode emitting at 975 nm [139,140,141,142,143],erbium oxide (Er 2 O 3 ) nano-powders excited by a laser diode emitting at 800 and 975 nm [144]. …”

Section: Nanoscale-related Unconventional Production Of White Lightmentioning

confidence: 99%

Nanophosphors-Based White Light Sources

Cesaria

Bartolo

2019

Nanomaterials

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Miniaturization requests and progress in nanofabrication are prompting worldwide interest in nanophosphors as white-emission mercury-free lighting sources. By comparison with their bulk counterparts, nanophosphors exhibit reduced concentration quenching effects and a great potential to enhance luminescence efficiency and tunability. In this paper, the physics of the nanophoshors is overviewed with a focus on the impact of spatial confinement and surface-to-volume ratio on the luminescence issue, as well as rare earth-activated multicolor emission for white light (WL) output. In this respect, the prominently practiced strategies to achieve WL emission are single nanophosphors directly yielding WL by means of co-doping and superposition of the individual red, green, and blue emissions from different nanophosphors. Recently, a new class of efficient broadband WL emitting nanophosphors has been proposed, i.e., nominally un-doped rare earth free oxide (yttrium oxide, Y2O3) nanopowders and Cr transition metal-doped garnet nanocrystals. In regard to this unconventional WL emission, the main points are: it is strictly a nanoscale phenomenon, the presence of an emitting center may favor WL emission without being necessary for observing it, and, its inherent origin is still unknown. A comparison between such an unconventional WL emission and the existing literature is presented to point out its novelty and superior lighting performances.

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Bright white up-conversion emission from sol–gel derived Yb3+/Er3+/Tm3+: Y2SiO5 nanocrystalline powders

Cited by 32 publications

References 18 publications

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm³⁺/Yb³⁺ Co–Doped Bi_3.64Mo_0.36O_6.55

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm³⁺/Yb³⁺ Co–Doped Bi_3.64Mo_0.36O_6.55

Broadband, White Light Emission from Doped and Undoped Insulators

Nanophosphors-Based White Light Sources

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Bright white up-conversion emission from sol–gel derived Yb3+/Er3+/Tm3+: Y2SiO5 nanocrystalline powders

Cited by 32 publications

References 18 publications

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm3+/Yb3+ Co–Doped Bi3.64Mo0.36O6.55

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm3+/Yb3+ Co–Doped Bi3.64Mo0.36O6.55

Broadband, White Light Emission from Doped and Undoped Insulators

Nanophosphors-Based White Light Sources

Contact Info

Product

Resources

About

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm³⁺/Yb³⁺ Co–Doped Bi_3.64Mo_0.36O_6.55

Synthesis and Enhanced Visible‐Light Photocatalytic Activity of Tm³⁺/Yb³⁺ Co–Doped Bi_3.64Mo_0.36O_6.55