Dependence of the Lifetime upon the Excitation Energy and Intramolecular Energy Transfer Rates: The 5D0 EuIII Emission Case

Ferreira, Rute A. S.; Nolasco, Mariela M.; Roma, Ana C.; Longo, Ricardo L.; Malta, O.L.; Carlos, Luı́s D.

doi:10.1002/chem.201201736

Cited by 63 publications

(43 citation statements)

References 48 publications

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“…3 were solved numerically by a fourth-order Runge-Kutta method with an adaptive integration step, where the initial populations of the ground states (F-centre and benzoate) were set to 1/2 and zero for the other states 61 . These equations were propagated up to 0.1 s and the steadystate populations were used as the starting populations for a new propagation to determine the lifetimes 56 .…”

Section: Methodsmentioning

confidence: 99%

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

et al. 2014

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White light-emitting diodes (WLEDs) are candidates to revolutionize the lighting industry towards energy efficient and environmental friendly lighting and displays. The current challenges in WLEDs encompass high luminous efficiency, chromatic stability, high colourrending index and price competitiveness. Recently, the development of efficient and low-cost downconverting photoluminescent phosphors for ultraviolet/blue to white light conversion was highly investigated. Here we report a simple route to design high-efficient WLEDs by combining a commercial ultraviolet LED chip (InGaAsN, 390 nm) and boehmite (g-AlOOH) hybrid nanoplates. Unusually high quantum yields (Z yield ¼ 38-58%) result from a synergic energy transfer between the boehmite-related states and the triplet states of the benzoate ligands bound to the surface of the nanoplates. The nanoplates with Z yield ¼ 38% are able to emit white light with Commission International de l'Eclairage coordinates, colour-rendering index and correlated colour temperature values of (0.32, 0.33), 85.5 and 6,111 K, respectively; overwhelming state-of-the-art single-phase ultraviolet-pumped WLEDs phosphors.

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Section: Methodsmentioning

confidence: 99%

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

et al. 2014

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“…Lifetimes and oscillator strengths have been studied as a function of local environment [11][12][13][14], ion concentration [15][16][17], and particle size [18][19][20][21][22][23]. But so far, research has focused solely on detecting and enhancing spontaneous MD emission, with no work done on selective excitation through magnetic fields.…”

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confidence: 99%

Excitation of Magnetic Dipole Transitions at Optical Frequencies

et al. 2015

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We use the magnetic field distribution of an azimuthally polarized focused laser beam to excite a magnetic dipole transition in Eu 3þ ions embedded in a Y 2 O 3 nanoparticle. The absence of the electric field at the focus of an azimuthally polarized beam allows us to unambiguously demonstrate that the nanoparticle is excited by the magnetic dipole transition near 527.5 nm. When the laser wavelength is resonant with the magnetic dipole transition, the nanoparticle maps the local magnetic field distribution, whereas when the laser wavelength is resonant with an electric dipole transition, the nanoparticle is sensitive to the local electric field. Hence, by tuning the excitation wavelength, we can selectively excite magnetic or electric dipole transitions through optical fields. DOI: 10.1103/PhysRevLett.114.163903 PACS numbers: 42.60. v, 42.25.Ja, 71.20.Eh, 78.67.Bf In the optical frequency regime, magnetic dipole transitions are orders of magnitude weaker than their electric dipole counterparts [1][2][3]. Because of this, magnetic dipole (MD) transitions are often neglected in optics, and the study of light-matter interactions becomes instead the study of interactions between electric fields and electric dipoles (ED). Perhaps the most well-known exceptions occur in the fields of metamaterials [4] and photonic crystal cavities [5,6], in which specially engineered structures can be produced to enhance interactions with the magnetic field. Nature, however, also provides materials with strong MD transitions, namely, rare earth ions. Many of their MD transitions are found within the visible spectrum, making them promising candidates for the optical excitation of MD transitions.Much theoretical and experimental work has been done exploring the MD and ED contributions to spontaneous emission from Eu 3þ and other trivalent rare earth ions [1,[7][8][9][10]. Lifetimes and oscillator strengths have been studied as a function of local environment [11][12][13][14], ion concentration [15][16][17], and particle size [18][19][20][21][22][23]. But so far, research has focused solely on detecting and enhancing spontaneous MD emission, with no work done on selective excitation through magnetic fields. In 1939, Deutschbein first identified the MD character of the 7 F 0 → 5 D 1 transition in Eu 3þ (c.f. Fig. 1(a)) by exploiting the birefringence of EuðBrO 3 Þ 3 · 9H 2 O and EuðC 2 H 5 SO 4 Þ 3 · 9H 2 O crystals [24]. He could deduce the MD or ED character of a transition by recording absorption or emission spectra for ordinary and extraordinary polarizations and comparing them to a spectrum taken along the c axis of the crystal. However, he could not selectively address individual transitions. Here, we report the direct and selective optical excitation of a MD transition in the rare earth ion Eu 3þ .The light-matter interaction between a charge-neutral quantum system and an electromagnetic field can be represented by a multipole expansion of the interaction Hamiltonianwith p being the electric dipole moment, m the magnetic dipole ...

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“…Other investigations reporting the use and/or development of theoretical models or methodologies have been discussed in the literature [8,12,13,15,17,28,43,55,56,86,[199][200][201][202][203][204][205][206][207].…”

Section: Theoretical Methods and Methodologiesmentioning

confidence: 99%

“…Other investigations on the luminescence properties of lanthanide-based systems with NPs, nanorods or systems assembled using sol-gel techniques have been reported in the literature [17,22,27,33,34,38,40,43,45,49,50,60,61,67,73,78,82,88,93,107,[127][128][129]133,136,140,142,143,149,163,[169][170][171]176,178,201,211,212,214,[235][236][237][238][239][240][241][242][243][244][245]…”

Section: Nanoparticles Nanorods and Sol-gel Processmentioning

confidence: 99%

Recent advances in lanthanide spectroscopy in Brazil

Silva

Capelo

Albuquerque

2016

Journal of Luminescence

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a b s t r a c tThis rev Q2 iew discusses recent advances in lanthanide spectroscopy involving luminescence applications carried out in Brazil. The revised topics include glasses, sol-gel, light-emitting diodes, nanoparticles, metal-organic frameworks, coordination polymers, thin films, energy transfer processes, upconversion and development of new theoretical tools. The important role played by Prof. Oscar L. Malta on this subject is evidenced by his many contributions to the broad range of investigations reported here and this review is dedicated to him, on the occasion of his 60th birthday.& 2015 Published by Elsevier B.V.

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Dependence of the Lifetime upon the Excitation Energy and Intramolecular Energy Transfer Rates: The ⁵D₀ Eu^III Emission Case

Cited by 63 publications

References 48 publications

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

Excitation of Magnetic Dipole Transitions at Optical Frequencies

Recent advances in lanthanide spectroscopy in Brazil

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