Persistent luminescence upconversion for Er2O3 under 975nm excitation in vacuum

Wang, Jiwei; Hao, Jianhua; Tanner, Peter A.

doi:10.1016/j.jlumin.2015.03.018

Cited by 19 publications

(25 citation statements)

References 28 publications

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“…If our predicted energies can be released in wavelength in terms of photons, the value with 521 nm (2.37 eV) has a mean relative error (MRE) of 4%. Considering that the acceptable error usually found in experimental measurements is 30% to 50%, 83 this prediction is confirmed from our energy conversion model with good consistency and in agreement with experimental observations. 48 Eqn (5), (6) and (8) actually show a defect reaction cycle.…”

Section: +supporting

confidence: 88%

“…We find the behavior of eqn ( 14) is very similar to the experiments of persistent luminescence. 20,21,37,83 Eqn ( 9) and (10) show the cases of single luminescence peaks within different charge states due to the subtle interplay of multi-defect reactions. For a single persistent luminescence peak with ÀU eff for O-defects, eqn (11) seems to be valid in many cases.…”

Section: S-richmentioning

confidence: 99%

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Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS

Huang

2016

Phys. Chem. Chem. Phys.

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We interpreted the mechanisms of energy harvesting and conversion for intrinsic upconverted mechano-persistent luminescence in CaZnOS through a native point defects study. We found that vacancy defects such as Zn and O vacancies, as well as Schottky pair defects, act as energy harvesting centers; they are very readily formed and very active. They are found to be extra deep electron or hole trap levels near the valence or conduction band edges, respectively. This leads to a coupling and exchange effect to continuously collect and transport host charges along a path via localized states to deep recombination levels. The initiating energy barrier is small and can be overcome by ambient thermal stimulation or quantum tunneling. Native activators such as V

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Section: +supporting

confidence: 88%

Section: S-richmentioning

confidence: 99%

Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS

Huang

2016

Phys. Chem. Chem. Phys.

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“…[15][16][17][18][19][20] These PSL nanocrystals (NCs) are able to emit light on demand by using near-infrared (NIR) light with lower energy such as a 980 nm diode laser for stimulation. [21][22][23][24][25] The feature of anti-Stokes photon upconversion of PSL NCs, along with the high tissue penetration depth and the absence of autouorescence in biological specimens under NIR stimulation, makes them extremely suitable for use as sensitive luminescent nanoprobes for various bioapplications. [26][27][28][29][30] Rare earth (RE) doped alkaline-earth suldes (AES), as famous electron-trapping materials, have shown great promise in many technological elds because of their excellent cathodoluminescence, electroluminescence, photoluminescence (PL), PersL, and PSL properties.…”

Section: Introductionmentioning

confidence: 99%

Broadband NIR photostimulated luminescence nanoprobes based on CaS:Eu²⁺,Sm³⁺ nanocrystals

Gao

Zheng

et al. 2019

Chem. Sci.

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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. Also, in the work presented here (Figures 1c, 2c, 6b, and 12c) there are significant differences between the observed emission and Planck's blackbody curve.…”

Section: Discussionmentioning

confidence: 95%

“…For example, the white light intensity was measured to be ∼5 times stronger at vacuum pressure than at atmospheric pressure at an excitation power of 4 Watts. The peaks observed in the low-pressure spectrum correspond to emission transitions of Er 3+ : 4 24 at low pressure in Er 2 O 3 . The color temperature of Er 2 O 3 nano-crystalline powder at room and vacuum condition under 4 Watts of 975 nm infrared excitation were measured to be 2467 K and 2281 K, respectively.…”

Section: Partially-doped Nano-powdersmentioning

confidence: 89%

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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Persistent luminescence upconversion for Er2O3 under 975nm excitation in vacuum

Cited by 19 publications

References 28 publications

Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS

Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS

Broadband NIR photostimulated luminescence nanoprobes based on CaS:Eu²⁺,Sm³⁺ nanocrystals

Broadband, White Light Emission from Doped and Undoped Insulators

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Persistent luminescence upconversion for Er2O3 under 975nm excitation in vacuum

Cited by 19 publications

References 28 publications

Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS

Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS

Broadband NIR photostimulated luminescence nanoprobes based on CaS:Eu2+,Sm3+ nanocrystals

Broadband, White Light Emission from Doped and Undoped Insulators

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Broadband NIR photostimulated luminescence nanoprobes based on CaS:Eu²⁺,Sm³⁺ nanocrystals