Eu2+/Eu3+-doped oxyfluoride glass ceramics with LaF3 for white LED color conversion

Lee, Sang Hun; Bae, Suk-Rok; Choi, Yong Gyu; Chung, Woon Jin

doi:10.1016/j.optmat.2014.10.018

Cited by 26 publications

(9 citation statements)

References 21 publications

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“…Additionally, white light was also observed in Eu 2+ -Eu 3+ codoped LaF 3 based nGCs under UV excitation by S.H. Lee et al [9], and in nGCs comprising Yb 3+ -Er 3+ co-doped LiYF 4 NCs and Yb 3+ -Ho 3+ -Tm 3+ -Ce 3+ co-doped YF 3 NCs, under IR excitation, by M. Secu et al [23] and D. Chen et al [24] respectively.…”

Section: Introductionmentioning

confidence: 89%

“…Nano-materials doped with rare-earth (RE) ions are an important class of materials, for they present a broad range of applications, such as temperature sensors, solid-state lasers, optical amplifiers, lighting and displays, solar cells, labelling, and so on [1][2][3][4][5][6][7]. In particular, RE-doped oxyfluoride nano-glass-ceramics (nGCs) are currently being extensively investigated as blue or UV converting white light emitting diodes wLEDs in order to replace the traditional phosphors powder and organic resins, respectively [4,[8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…silica), which is very important for their practical applications. In this regard, RE doped-oxifluoride nGCs containing Y and La based (with similar ionic radii and valence) NCs have been widely investigated [2,9,[17][18][19][20][21][22][23][24] due to the easy and homogeneous incorporation of RE ions into the fluoride nanocrystalline phase, which enhances the photoluminescence efficiency. In particular, in nGCs containing Tm 3+ -Yb 3+ co-doped YF 3 NCs [2] and Er 3+ -Tb 3+ -Yb 3+ co-doped Ba 2 LaF 7 NCs [17], up-conversion emissions were studied by D. Chen et al and H. K. Dan et al, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Bright luminescence of Gd3+ sensitized RE3+-doped SiO2-BaGdF5 glass-ceramics for UV-LEDs colour conversion

Yanes

del-Castillo

2017

Journal of Alloys and Compounds

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RE-doped (Eu 3+ , Sm 3+ , Dy 3+ or Tb 3+) nano-glass-ceramics containing BaGdF 5 nanocrystals, have been successfully obtained under thermal treatment of precursor sol-gel glasses. X-ray diffraction, high-resolution transmission electron microscope images and energy dispersive X-ray spectroscopy measurements confirmed the precipitation and distribution of cubic BaGdF 5 nanocrystals (around 10 nm in size) in the glass matrix. The luminescent properties, via excitation and emission spectra along with decay curves, were studied. In order to complete the structural analysis, the luminescent features of Eu 3+ and Sm 3+ ions were also used as sensitive probes, confirming the distribution of a significant fraction of dopant ions into the fluoride nanocrystalline environment. Intense visible emissions were obtained through efficient energy transfer from Gd 3+ to RE ions, which leads to consider these materials as potential emitting phosphors for colour converted UV LEDs.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bright luminescence of Gd3+ sensitized RE3+-doped SiO2-BaGdF5 glass-ceramics for UV-LEDs colour conversion

Yanes

del-Castillo

2017

Journal of Alloys and Compounds

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“…Oxyfluoride nano-glass-ceramics doped with optically active rare earth ions (RE 3+ ) have gained great attention due to their favorable behavior as a result of mixing the advantages of fluoride nanocrystals with an oxide glassy host [9][10][11][12][13]. Indeed, because of their undoubtedly outstanding properties, such a class of optical materials is indispensable in the development of optoelectronics, offering promising applications in optical thermometers [14][15][16][17], LEDs [18][19][20], waveguides [21], and lasers [22]. The optical properties of oxyfluoride nano-glass-ceramics depend on several fundamental factors.…”

Section: Introductionmentioning

confidence: 99%

Studies of Sol-Gel Evolution and Distribution of Eu3+ Ions in Glass–Ceramics Containing LaF3 Nanocrystals Depending on Initial Sols Composition

Pawlik

Szpikowska‐Sroka

Goryczka

et al. 2021

IJMS

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In this work, we performed a systematic analysis of the impact of selected chemical reagents used in sol-gel synthesis (i.e., N,N-dimethylformamide) and different catalyst agents (i.e., CH3COOH, HNO3) on the formation and luminescence of Eu3+-doped SiO2–LaF3 nano-glass–ceramics. Due to the characteristic nature of intra-configurational electronic transitions of Eu3+ ions within the 4f6 manifold (5D0 → 7FJ, J = 0–4), they are frequently used as a spectral probe. Thus, the changes in the photoluminescence profile of Eu3+ ions could identify the general tendency of rare earth materials to segregate inside low-phonon energy fluoride nanocrystals, which allows us to assess their application potential in optoelectronics. Fabricated sol-gel materials, from sols to gels and xerogels to nano-glass–ceramics, were examined using several experimental techniques: X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (IR), and luminescence measurements. It was found that the distribution of Eu3+ ions between the amorphous silicate sol-gel host and LaF3 nanocrystals is strictly dependent on the initial composition of the obtained sols, and the lack of N,N-dimethylformamide significantly promotes the segregation of Eu3+ ions inside LaF3 nanocrystals. As a result, we detected long-lived luminescence from the 5D0 excited state equal to 6.21 ms, which predisposes the obtained glass–ceramic material for use as an optical element in reddish-orange emitting devices.

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“…Oxyfluoride glass-ceramics are transparent composite materials consisting of the oxide glass matrix and fluoride micro-and nanocrystals obtained by a thermal annealing of the initial oxyfluoride glass [1]. Activated oxyfluoride glass ceramics have found an application as infrared convertors [2], and are considered for applications as scintillators [3] and phosphors for white LED's [4].…”

Section: Introductionmentioning

confidence: 99%

Optical Detection of Paramagnetic Centres in Activated Oxyfluoride Glass-Ceramics

et al. 2018

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Electron paramagnetic resonance (EPR), magnetic circular dichroism (MCD) and EPR detected via MCD (MCD-EPR) investigations have been performed on rare-earth activated oxyfluoride glasses and glass-ceramics. Er 3+ , Gd 3+ , and Mn 2+ activators in oxyfluoride glass-ceramics show paramagnetic MCD behaviour and the MCD-EPR has been detected. The results of the MCD-EPR measurements for the Er-doped oxyfluoride glass-ceramics showed that Er 3+ ions in the CaF2 crystallites in these ceramics embed only in the cubic symmetry environment, similarly to the previous observations of cubic Gd 3+ centres in the glass-ceramics containing CaF2. Finally, the correlation of optics and paramagnetic centres is discussed for Mn-doped YAlO3 ceramics.

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Eu2+/Eu3+-doped oxyfluoride glass ceramics with LaF3 for white LED color conversion

Cited by 26 publications

References 21 publications

Bright luminescence of Gd3+ sensitized RE3+-doped SiO2-BaGdF5 glass-ceramics for UV-LEDs colour conversion

Bright luminescence of Gd3+ sensitized RE3+-doped SiO2-BaGdF5 glass-ceramics for UV-LEDs colour conversion

Studies of Sol-Gel Evolution and Distribution of Eu3+ Ions in Glass–Ceramics Containing LaF3 Nanocrystals Depending on Initial Sols Composition

Optical Detection of Paramagnetic Centres in Activated Oxyfluoride Glass-Ceramics

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