A Review of Recent Results of White Light Generation and Tunable Visible Light Emission by Ag Nanoclusters: Undoped and Doped Tm3+ /Yb3+ Doped Geo2-Pbo Glasses

Nishimura, Marcos Vinicius de Morais; Bordon, Camila Dias da Silva; Miretzcky, Lucas Magalhães; Kassab, L.R.P.

doi:10.51859/amplla.sst631.1122-3

Cited by 2 publications

(4 citation statements)

References 219 publications

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“…A broad PL band and tunable visible light emission can be observed for the GP 4.5% Ag sample reported in a previous work [39], which is attributed to NCs of varying sizes. As the Ag NC emission peak wavelength is size-dependent, the PL in the blue region corresponds to the emission by smaller-sized Ag NCs.…”

Section: Resultssupporting

confidence: 65%

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Tunable Visible Light and Energy Transfer Mechanism in Tm3+ and Silver Nanoclusters within Co-Doped GeO2-PbO Glasses

Nishimura,

Amaro,

Bordon

et al. 2023

Micromachines

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This study introduces a novel method for producing Ag nanoclusters (NCs) within GeO2-PbO glasses doped with Tm3+ ions. Sample preparation involved the melt-quenching method, employing adequate heat treatment to facilitate Ag NC formation. Absorption spectroscopy confirmed trivalent rare-earth ion incorporation. Ag NC identification and the amorphous structure were observed using transmission electron microscopy. A tunable visible emission from blue to the yellow region was observed. The energy transfer mechanism from Ag NCs to Tm3+ ions was demonstrated by enhanced 800 nm emission under 380 and 400 nm excitations, mainly for samples with a higher concentration of Ag NCs; moreover, the long lifetime decrease of Ag NCs at 600 nm (excited at 380 and 400 nm) and the lifetime increase of Tm3+ ions at 800 nm (excitation of 405 nm) corroborated the energy transfer between those species. Therefore, we attribute this energy transfer mechanism to the decay processes from S1→T1 and T1→S0 levels of Ag NCs to the 3H4 level of Tm3+ ions serving as the primary path of energy transfer in this system. GeO2-PbO glasses demonstrated potential as materials to host Ag NCs with applications for photonics as solar cell coatings, wideband light sources, and continuous-wave tunable lasers in the visible spectrum, among others.

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Section: Resultssupporting

confidence: 65%

“…GP Tm 2.25% Ag 220 ± 4 GP Tm 4.5% Ag TEM analyses were carried out on the GP 4.5% Ag and GP Tm 4.5% Ag samples, as illustrated in Figure 10. We highlight that the TEM results for the GP 4.5% Ag sample, used as a reference in the present study, were already reported [39], and further analysis is provided in this work.…”

Section: Sample Time (µS)supporting

confidence: 66%

Tunable Visible Light and Energy Transfer Mechanism in Tm3+ and Silver Nanoclusters within Co-Doped GeO2-PbO Glasses

Nishimura,

Amaro,

Bordon

et al. 2023

Micromachines

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“…Podemos notar que, ao contrário do caso anterior, é preciso um tempo maior para haver a diminuição da concentração de NCs de prata e consequente redução da emissão, para tratamento de 24h; para as amostras tratadas a 470°C com somente 6 horas de tratamento já ocorre diminuição da emissão. A interferência dos íons de Yb 3+ no tamanho dos NCs de prata foi observada em trabalho recente do grupo como mostra claramente a figura 2.25, onde notamos o deslocamento da banda de emissão dos NCs de prata na presença de íons de Yb 3+ [59]. Este fato é também observado na literatura quando são introduzidos íons de Yb 3+ , em matrizes de vidros oxifluoreto [55],…”

Section: Resultados De Nanoclusters De Prata Em Vidros Germanatounclassified

“…É observado também que o aumento do tempo de tratamento para o material favorece a formação das NPs de prata; neste processo a viscosidade e temperatura do tratamento térmico no material são importantes [38]. Temperaturas de tratamento térmico acima da temperatura de transição vítrea reduzem a viscosidade do material, aumentando a taxa de formação dos aglomerados de prata, originando em consequência as NPs de prata; temperaturas inferiores à de transição vítrea favorecem a formação de NCs de prata e dificultam a formação de NPs de prata [35,39]. As transições dos estados de energia permitidas por spin ocorrem entre estados singletosingleto e entre estados tripleto-tripleto, apresentando tempo de vida relativamente rápidos.…”

Section: Nanoclusters Metálicos De Prata: Formação E Definiçãounclassified

Influência de incorporação de >i<nanoclusters>/i< de prata nas propriedades ópticas de vidros germanato dopados com íons de Yb>sup<3+>/sup< para aplicações em fotônica.

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The purpose of this work is to produce and characterize GeO2-PbO (GP) glass samples codoped with Yb 3+ ions and silver nanoclusters (silver NCs), and to study the mechanisms of energy transfer between them. The glass samples were produced by the melt-quenching technique followed by rapid cooling to relieve internal stress; additional treatments were performed to promote the growth of silver NCs. The silver NCs and Yb 3+ ions emissions were analyzed with excitation at different wavelengths. The silver NCs emission showed tunable light emission in the visible region of the electromagnetic spectrum for different concentrations of Yb 3+ and also for excitations in the range of 355-410 nm. The dependence of emission tuning on the concentration of Yb 3+ is due to the fact that they normally restrict the size of silver NCs. By analyzing the silver NCs and Yb 3+ ions lifetime, and measuring luminescence, energy transfer mechanisms between them were studied and confirmed. Energy transfer between silver NCs and Yb 3+ ions at 980 nm was observed for excitations at 355 and 410 nm. In the first case, an increase of over 100% in the emission of Yb 3+ ions was observed for the sample 4.5% AgNO3/4.5% Yb2O3, and in the second case, an increase of over 1000% was observed for the sample 4.5% AgNO3/2% Yb2O3 (weight total %). Larger silver NCs are more adequately excited at longer wavelengths, which explains the efficient energy transfer mechanisms for the 4.5% AgNO3/2% Yb2O3 sample when excited at 410 nm. Energy transfer occurs through the S1→T1 decays (spin-forbidden electronic transition between singlet-triplet states) of the silver NCs to the Yb 3+ ions. A decrease in the short and long lifetimes of the silver NCs at 550 nm (for excitations at 355, 380 and 405 nm) and 800 nm (for excitation at 405 nm) was observed in samples co-doped with Yb 3+ ions, compared to the sample doped only with AgNO3, supporting the mentioned energy transfer mechanism. To verify the influence of Yb 3+ ions on the formation of silver NCs, transmission electron microscopy (TEM) measurements were performed, which showed a change in the average size when added Yb 3+ ions (the average size changes from 4.7 to 3.0 and 2.2 nm). These results confirm for the first time the possibility of producing GP glasses with silver NCs and Yb 3+ ions, and the energy transfer mechanism between them, with applications for photonic devices such as devices with tunable light emission, solar cells, and broadband visible light sources.

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A Review of Recent Results of White Light Generation and Tunable Visible Light Emission by Ag Nanoclusters: Undoped and Doped Tm3+ /Yb3+ Doped Geo2-Pbo Glasses

Cited by 2 publications

References 219 publications

Tunable Visible Light and Energy Transfer Mechanism in Tm3+ and Silver Nanoclusters within Co-Doped GeO2-PbO Glasses

Tunable Visible Light and Energy Transfer Mechanism in Tm3+ and Silver Nanoclusters within Co-Doped GeO2-PbO Glasses

Influência de incorporação de >i<nanoclusters>/i< de prata nas propriedades ópticas de vidros germanato dopados com íons de Yb>sup<3+>/sup< para aplicações em fotônica.

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