Toward a new generation of white phosphors for solid state lighting using glassy yttrium aluminoborates

Guimarães, Vinicius Ferraz; Maia, Lauro J. Q.; Gautier‐Luneau, Isabelle; Bouchard, Christophe; Hernandes, Antônio Carlos; Thomas, Fabrice; Ferrier, Alban; Viana, Bruno; Ibanez, Alain

doi:10.1039/c5tc00237k

Cited by 28 publications

(28 citation statements)

References 39 publications

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“…[1] In ar ecent work, we reported bright white emission in amorphous yttrium aluminum borate (a-YAB) powders,free of lanthanides or other metal-active ions. [9,10] These powders obtained by am odified Pechini method have ac omposition close to YA l 3 (BO 3 ) 4 after thermal treatments.T he PL iQY is about 90 %u nder NUV excitation at 365 nm with high color rendering indexes (92-94), ideal for white LED devices under NUV excitation. On the other hand, we also showed that the PL efficiencyo fa -YAB powders exhibits ac orrelation with the presence of paramagnetic centers (radicals) evidenced by electron paramagnetic resonance (EPR) spectroscopy.…”

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confidence: 75%

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Evidence of Organic Luminescent Centers in Sol–Gel‐Synthesized Yttrium Aluminum Borate Matrix Leading to Bright Visible Emission

et al. 2017

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Yttrium aluminum borate (YAB) powders prepared by sol-gel process have been investigated to understand their photoluminescence (PL) mechanism. The amorphous YAB powders exhibit bright visible PL from blue emission for powders calcined at 450 °C to broad white PL for higher calcination temperature. Thanks to C labelling, NMR and EPR studies show that propionic acid initially used to solubilize the yttrium nitrate is decomposed into aromatic molecules confined within the inorganic matrix. DTA-TG-MS analyses show around 2 wt % of carbogenic species. The PL broadening corresponds to the apparition of a new band at 550 nm, associated with the formation of aromatic species. Furthermore, pulsed ENDOR spectroscopy combined with DFT calculations enables us to ascribe EPR spectra to free radicals derived from small (2 to 3 rings) polycyclic aromatic hydrocarbons (PAH). PAH molecules are thus at the origin of the PL as corroborated by slow afterglow decay and thermoluminescence experiments.

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confidence: 75%

“…On the other hand, we also showed that the PL efficiencyo fa -YAB powders exhibits ac orrelation with the presence of paramagnetic centers (radicals) evidenced by electron paramagnetic resonance (EPR) spectroscopy. [9] Nevertheless,t he exact nature of the emitting centers in such promising PL materials is not yet accurately identified.…”

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confidence: 99%

Evidence of Organic Luminescent Centers in Sol–Gel‐Synthesized Yttrium Aluminum Borate Matrix Leading to Bright Visible Emission

et al. 2017

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“…However, there is no clear correlation between the Pr content and the intensity of this signal. Although the presence of the half resonance at g = 4.3 implies that a half res- onance signal at g = 2.1 ( m s = ±1) should be observed, it is hard to distinguish the corresponding signal around 3500 G (g = 2.1), due to the strong background signal at around 3000 G. The small signal at g = 2.0, which was previously attributed to the NBO or peroxide radicals hole traps [39], is clearly confirmed only for the un-doped glass (x = 0), and no such clear signal is observed for other compositions (x = 0.5 and 1.0). In view of the relationship between the intensity of TSL glow curves and the Pr concentration, it appears that the origin of TSL, i.e., traps present in the host, are not ESR active species.…”

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confidence: 94%

Photoluminescence and radioluminescence in Pr-doped lanthanum aluminoborate glasses

Kaneko

Masai

Okada

et al. 2017

Journal of Asian Ceramic Societies

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Photoluminescence (PL) and radioluminescence properties of Pr-doped lanthanum aluminoborate glasses with the composition xPr-20La 2 O 3-30Al 2 O 3-50B 2 O 3 (0 ≤ x ≤ 1.0) were studied. In the PL spectra, the characteristic emission bands due to both f-f and the d-f transitions of Pr 3+ were confirmed for the glass system. In X-ray induced scintillation spectra, emission from the host matrix was observed in addition to emission bands from d-f and the f-f transitions of Pr 3+ ; the peak area ratio of the host to the f-f transition depended on the Pr content. It is significant that emission from the host was confirmed in both X-ray-induced scintillation and thermally stimulated luminescence, and the emission intensity from the host decreased with an increase in the Pr content. It is suggested that doping with Pr decreases the number of trap sites in the host glass.

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“…Finally, they are easily workable and can be prepared in a variety of forms and geometry including optical fibres. In particular, yttriaaluminoborate (YAB) and, more generally, lanthanide oxide-aluminoborate glasses have been proved to be a suitable matrix for RE incorporation and for the realization of optical materials thanks to their chemical durability, high transparency and mechanical strength [2][3][4][5][6]. Within the compositions available in the glassforming region of the Y 2 O 3 -Al 2 O 3 -B 2 O 3 system [2,7], a relevant role as possible interesting optical materials can be found for composition with molar ratios close to that of YAl 3 (BO 3 ) 4 .…”

Section: Introductionmentioning

confidence: 99%

Radio- and photoluminescence properties of Ce/Tb co-doped glasses with huntite-like composition

et al. 2018

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Optical properties of yttria-aluminoborate (YAB) glasses with general composition 10(Ce x Tb y Y (1-x-y))-30Al 2 O 3-60B 2 O 3 are investigated and compared with data available on YAB crystals with huntite-like structure. Ce doped samples show optical features ascribable to preferential location of rare earth ions in sites with specific geometry similar to that observed in crystalline structures. Samples prepared with Tb ions as emission activator and Ce ions as sensitizer have been studied within the framework of non-radiative energy transfer. The resulting Förster radius is of 4.6±0.5 Å comparable with that observed in Ce/Tb co-doped YAl 3 (BO 3) 4 crystals. The investigated materials possess radio-and photoluminescence emission efficiencies and performances comparable to that of crystalline counterparts with the advantage of having easiness of preparation and workability typical of glassy systems.

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Toward a new generation of white phosphors for solid state lighting using glassy yttrium aluminoborates

Abstract: International audienc

Cited by 28 publications

References 39 publications

Evidence of Organic Luminescent Centers in Sol–Gel‐Synthesized Yttrium Aluminum Borate Matrix Leading to Bright Visible Emission

Evidence of Organic Luminescent Centers in Sol–Gel‐Synthesized Yttrium Aluminum Borate Matrix Leading to Bright Visible Emission

Photoluminescence and radioluminescence in Pr-doped lanthanum aluminoborate glasses

Radio- and photoluminescence properties of Ce/Tb co-doped glasses with huntite-like composition

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