On the efficient warm white-light emission from nano-sized Y2O3

Cesaria, Maura; Collins, John; Bartolo, Baldassare Di

doi:10.1016/j.jlumin.2015.08.017

Cited by 19 publications

(16 citation statements)

References 68 publications

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“…Since then, the white emission has been observed in rare earth doped nanocrystalline powders, ceramic, glasses and bulk crystals, as investigated by several groups1011121314151617181920. The bright white emission was also reported for undoped nanocrystalline powders by the Di Bartollo group212223.…”

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confidence: 91%

Laser induced white lighting of graphene foam

Stręk¹,

Tomala²,

Łukaszewicz³

et al. 2017

Sci Rep

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Laser induced white light emission was observed from porous graphene foam irradiated with a focused continuous wave beam of the infrared laser diode. It was found that the intensity of the emission increases exponentially with increasing laser power density, having a saturation level at ca. 1.5 W and being characterized by stable emission conditions. It was also observed that the white light emission is spatially confined to the focal point dimensions of the illuminating laser light. Several other features of the laser induced white light emission were also discussed. It was observed that the white light emission is highly dependent on the electric field intensity, allowing one to modulate the emission intensity. The electric field intensity ca. 0.5 V/μm was able to decrease the white light intensity by half. Origins of the laser-induced white light emission along with its characteristic features were discussed in terms of avalanche multiphoton ionization, inter-valence charge transfer and possible plasma build-up processes. It is shown that the laser-induced white light emission may be well utilized in new types of white light sources.

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mentioning

confidence: 91%

Laser induced white lighting of graphene foam

Stręk¹,

Tomala²,

Łukaszewicz³

et al. 2017

Sci Rep

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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%

“…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],…”

Section: Nanoscale-related Unconventional Production Of White Lightmentioning

confidence: 99%

“…In regard to the first point, a critical discussion of the experimental findings was reported in the case of Y 2 O 3 nanoparticles [19]. Turning to the comparison with the existing scenario, it is a common characteristics of the existing WL emission strategies and unconventional WL emission that WL intensity and generation can be tuned by pressure, excitation intensity and wavelength, chemical environment (gas background, doping, surface effects), size, and temperature, according to the following experimental evidence.…”

Section: Nanoscale-related Unconventional Production Of White Lightmentioning

confidence: 99%

“…The paper is organized as follows: after a general introduction about the emission mechanisms and physics of phosphors and RE dopants, a section will be devoted to the spectroscopy of nanophosphors and, in addition, a section dealing with the experimental findings related to the observed unconventional WL emission will be presented. In this respect, main points resulting from the experimental evidence are: first, such unconventional WL emission is a nanoscale phenomenon, second, its occurrence is strictly related to the host matrix because, although doping can favor WL emission, doping is not needed, and third, its inherent origin is still unknown, despite an attempt of interpretation of the experimental findings [19]. By comparison with the existing scenario, challenging questions to be addressed at the fundamental level will be pointed out and discussed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Luminescence Spectroscopy of Nanophosphors

Cesaria

Bartolo

2017

NATO Science for Peace and Security Series B: Physics and Biophysics

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On the efficient warm white-light emission from nano-sized Y2O3

Cited by 19 publications

References 68 publications

Laser induced white lighting of graphene foam

Laser induced white lighting of graphene foam

Nanophosphors-Based White Light Sources

Luminescence Spectroscopy of Nanophosphors

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