Ho<sup>3+</sup>‐doped strontium–aluminium–bismuth–borate glasses for green light emission

Rajesh, D.; Naidu, M. Dhamodhara; Ratnakaram, Y.C.; Balakrishna, A.

doi:10.1002/bio.2632

Cited by 20 publications

(8 citation statements)

References 26 publications

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“…5 I 8 ! ( 5 S 2 , 4 F 4 ) channel; similar result was reported elsewhere [9,21,40]. From Figure 7b, one can notice that there is sufficient overlap of absorption and emission spectra around 550 nm, which leads to RET or back energy transfer when the inter-ionic distance between Ho 3+ ions decreases drastically.…”

Section: Judd-ofelt (J-o) Analysissupporting

confidence: 85%

“…Ravi Prakash et al have studied optical, photoluminescent emission, and decay properties of Ho 3+ ‐doped germanate‐bismuth glasses of composition: 40GeO 2 + 20Bi 2 O 3 + 10Gd 2 O 3 + 20Na 2 O + 10BaO reported a better physical and luminescene properties [18]. Rajesh et al have prepared Ho 3+ ‐doped bismuth‐borate glasses (50B 2 O 3 + 20Bi 2 O 3 + 7AlF 3 + 8SrO + 15SrF 2 ) and noticed a reduction in melting point as well as an increase in density, a good improvement in luminescence properties [21]. Yang et al have prepared Ho 3+ /Yb 3+ co‐doped boro‐germanate glasses of composition (80‐ x )GeO 2 + 10BaO + 2Yb 2 O 3 + xB 2 O 3 + 10ZnO + 0.5Ho 2 O 3 ( x = 0, 20, 40, 60) and reported efficient visible up‐conversion emission [19].…”

Section: Introductionmentioning

confidence: 99%

“…In this direction, the optimal combination of germanate‐borate, bismuth‐borate, and bismuth‐germanate glasses doped with RE 3+ ions has grabbed an attention owing to their remarkable improvement in most of the above‐mentioned properties. Several works have already been published in this direction [6, 14–22]. Ravi Prakash et al have studied optical, photoluminescent emission, and decay properties of Ho 3+ ‐doped germanate‐bismuth glasses of composition: 40GeO 2 + 20Bi 2 O 3 + 10Gd 2 O 3 + 20Na 2 O + 10BaO reported a better physical and luminescene properties [18].…”

Section: Introductionmentioning

confidence: 99%

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Optical, vibrational, and photoluminescence properties of holmium‐doped boro‐bismuth‐germanate glasses

Rathaiah,

Ravanamma,

Ravi

et al. 2024

Luminescence

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Holmium (Ho3+)‐doped boro‐bismuth‐germanate glasses having the chemical composition (30‐x)B2O3 + 20GeO2 + 20Bi2O3 + 20Na2O + 10Y2O3 + xHo2O3, where x = 0.1, 0.5, 1.0, and 2.0 mol% were prepared by melt‐quenching technique. The prepared glasses were examined for thermal, optical, vibrational, and photoluminescent properties. The prepared glasses were found to be thermally very stable. The optical bandgap and Urbach energies of 0.1 mol% Ho2O3‐doped boro‐bismuth‐germanate glass were calculated to be 3.3 eV and 377 MeV, respectively, using the absorption spectrum. The Judd–Ofelt analysis was performed on the 0.1 mol% Ho2O3‐doped glass and compared the obtained parameters with literature. The branching ratio (β) and emission cross‐section (σem) of the green band were determined to be 0.7 and 0.24 × 10−20 cm2, respectively. Under 450 nm excitation, a strong green emission around 550 nm was observed and assigned to the (5S2 + 5F4) → 5I8 (Ho3+) transition. Upon an increase of Ho2O3 content from 0.1 to 2.0 mol%, the intensities of all observed emission bands as well as decay time of the (5S2 + 5F4) → 5I8 transition have been decreased gradually. The reasons behind the decrease in emission intensity and decay time were discussed. The strong green emission suggests that these glasses may be a better option for display devices and green emission applications.

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Section: Judd-ofelt (J-o) Analysissupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical, vibrational, and photoluminescence properties of holmium‐doped boro‐bismuth‐germanate glasses

Rathaiah,

Ravanamma,

Ravi

et al. 2024

Luminescence

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“…The CIE 1931 diagram has been widely applied to gauge all possible colors by the combination of three primary colors (red, blue, and green), offering a pervasive method to quantify the tunability of the emission wavelength as well as the change of the emission intensity, and to acquire a good knowledge of the trueness of color for applications in light-emitting devices . In the CIE diagram, the chromaticity coordinate x represents the red-to-blue ratio, while y represents the green-to-blue ratio.…”

Section: Resultsmentioning

confidence: 99%

Lanthanide-Incorporated Borotungstates Including Keggin-type [BW₁₁O₃₉]^9– Fragments and Their Luminescence Properties

Jiang

Duan

Liu

et al. 2019

Crystal Growth & Design

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Three kinds of lanthanide (Ln)-substituted borotungstates including [BW11O39]9– segments KH2[Ce(H2O)8][(α-BW11O39)Ce(H2O)3]·14H2O (1), K2Na2H2[(α-BW11O39)Pr(H2O)3]·15H2O (2), and Na3K8H[W5O18]Ln[α-BW11O39]·22H2O [Ln = Eu3+ (3), Dy3+ (4), Ho3+ (5), Yb3+ (6)] were manufactured. Compound 1 adopts a one-dimensional (1-D) zigzag chain by fusing adjacent [Ce(H2O)8][(α-BW11O39)Ce(H2O)3]3– polyoxoanions in the help of Ce3+ bridging. It is worth noting that adjoining chains can be interacted with each other by K+ cations and give birth to a fascinating two-dimensional sheet. In contrast, the polyoxoanion of 2 is assembled from a mono-PrIII embedded [(α-BW11O39)Pr(H2O)3]6– unit, which also propagates an analogical 1-D chain like 1 without hanging [Ln(H2O)8]3+ cations. Compounds 3–6 display a typical mixed-POM dimeric assembly composed of monovacant Keggin [α-BW11O39)]9– and monovacant Lindqvist [W5O18]6– segments concatenated by an Ln cation. Luminescence performances of 3–5 were systematically probed at ambient temperature, exhibiting the featured emissions from f–f transitions of Ln ions. Meanwhile, energy transfer from borotungstate fragment to Ho3+ ion was observed in the emission process of 5.

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“…In recent years, the synthesis and optical characterization of rareearth (RE)-doped upconversion (UC) luminescent materials have attracted great interest due to their widespread applications in solid-state lasers, three-dimensional flat-panel displays and lightemitting diodes (LEDs) (1)(2)(3)(4)(5). RE-doped UC micro-crystals can emit high-energy photons under near-infrared excitation in a nonlinear optical UC process that results in visible emission (6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Tunable multicolor and white‐light upconversion luminescence in Yb³⁺/Tm³⁺/Ho³⁺ tri‐doped NaYF₄ micro‐crystals

Lin

Teng

et al. 2014

Luminescence

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NaYF4 micro-crystals with various concentrations of Yb(3+) /Tm(3+) /Ho(3+) were prepared successfully via a simple and reproducible hydrothermal route using EDTA as the chelating agent. Their phase structure and surface morphology were studied using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD patterns revealed that all the samples were pure hexagonal phase NaYF4. SEM images showed that Yb(3+)/Tm(3+)/Ho(3+) tri-doped NaYF4 were hexagonal micro-prisms. Upconversion photoluminescence spectra of Yb(3+)/Tm(3+)/Ho(3+) tri-doped NaYF4 micro-crystals with various dopant concentrations under 980 nm excitation with a 665 mW pump power were studied. Tunable multicolor (purple, purplish blue, yellowish green, green) and white light were achieved by simply adjusting the Ho(3+) concentration in 20%Yb(3+)/1%Tm(3+)/xHo(3+) tri-doped NaYF4 micro-crystals. Furthermore, white-light emissions could be obtained using different pump powers in 20%Yb(3+)/1%Tm(3+)/1%Ho(3+) tri-doped NaYF4 micro-crystals at 980 nm excitation. The pump power-dependent intensity relationship was studied and relevant energy transfer processes were discussed in detail. The results suggest that Yb(3+)/Tm(3+) Ho(3+) tri-doped NaYF4 micro-crystals have potential applications in optoelectronic devices such as photovoltaic, plasma display panel and white-light-emitting diodes.

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Ho³⁺‐doped strontium–aluminium–bismuth–borate glasses for green light emission

Cited by 20 publications

References 26 publications

Optical, vibrational, and photoluminescence properties of holmium‐doped boro‐bismuth‐germanate glasses

Optical, vibrational, and photoluminescence properties of holmium‐doped boro‐bismuth‐germanate glasses

Lanthanide-Incorporated Borotungstates Including Keggin-type [BW₁₁O₃₉]^9– Fragments and Their Luminescence Properties

Tunable multicolor and white‐light upconversion luminescence in Yb³⁺/Tm³⁺/Ho³⁺ tri‐doped NaYF₄ micro‐crystals

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Ho3+‐doped strontium–aluminium–bismuth–borate glasses for green light emission

Cited by 20 publications

References 26 publications

Optical, vibrational, and photoluminescence properties of holmium‐doped boro‐bismuth‐germanate glasses

Optical, vibrational, and photoluminescence properties of holmium‐doped boro‐bismuth‐germanate glasses

Lanthanide-Incorporated Borotungstates Including Keggin-type [BW11O39]9– Fragments and Their Luminescence Properties

Tunable multicolor and white‐light upconversion luminescence in Yb3+/Tm3+/Ho3+ tri‐doped NaYF4 micro‐crystals

Contact Info

Product

Resources

About

Ho³⁺‐doped strontium–aluminium–bismuth–borate glasses for green light emission

Lanthanide-Incorporated Borotungstates Including Keggin-type [BW₁₁O₃₉]^9– Fragments and Their Luminescence Properties

Tunable multicolor and white‐light upconversion luminescence in Yb³⁺/Tm³⁺/Ho³⁺ tri‐doped NaYF₄ micro‐crystals