<i>Optical Interactions in Solids</i>

Bartolo, Baldassare Di; Summitt, Robert

doi:10.1063/1.3021901

Cited by 73 publications

(19 citation statements)

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“…The portion of the diagram appropriate for the b 4 D 7/2 state of matrixisolated atomic manganese is on the bottom right hand side where the CFS is less than the spin-orbit splitting ͑SOS͒. Group theory predicts 24 that fields of cubic symmetry will produce three energetically distinct levels G, E 3 , and E 2 with degeneracies 25 of 4, 2, and 2, respectively, from an original value of 8 ͑2J+1͒ for the J = 7 / 2 level. If the CFS levels are populated statistically with y 6 P state excitation, then emission intensity ratios of 2:1:1 will occur.…”

Section: D State Emissionmentioning

confidence: 99%

Luminescence spectroscopy of matrix-isolated atomic manganese: Site size and orbital occupancy dependence of crystal field splitting

Collier

Byrne

Murray

et al. 2010

The Journal of Chemical Physics

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Narrow linewidth emission features observed in the near-UV following y 6 P state excitation of atomic manganese isolated in the solid rare gases are assigned to b 4 D and a 4 P states. These states arise from the 3d 5 4s 2 electronic configuration, identical to that of the 6 S ground state, and the origin of the narrow linewidths. Two thermally stable sites, labeled blue and red on the basis of their position in absorption spectra, are occupied by atomic Mn in Ar and Kr while a single site is present in Xe. The red site produces a single, narrow line emission for the b 4 D state at 329 nm. In contrast, a lineshape analysis of the complex blue site b 4 D state emission between 331 and 332 nm reveals the occurrence of three zero phonon lines ͑ZPLs͒. Millisecond emission decay curves recorded for these features are found to be complex, requiring double and triple exponential fit functions. The origins of the complex decays and multiple ZPLs are shown to arise from weak crystal field splitting ͑CFS͒ of the J = 7 / 2 spin-orbit level of the b 4 D state of atomic Mn isolated in the blue site of the solid rare gases. Fields of cubic symmetry are capable of inducing splitting for J Ͼ 3 / 2 so atoms isolated in both single vacancy and tetravacancy sites in the fcc lattices of the solid rare gases are prone to this effect. b 4 D state emission is also produced following y 6 P excitation for Mn atoms occupying the red sites in Ar and Kr. However, Mn atoms isolated in the larger tetravacancy sites have small matrix shifts and do not exhibit any CFS. The magnitudes of the weak CF splittings are shown to depend on both the excited state electronic configurations 3d 5 4s 2 b 4 D and 3d 6 4s 1 a 4 D states and the size of the matrix site occupied by atomic Mn.

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Section: D State Emissionmentioning

confidence: 99%

Luminescence spectroscopy of matrix-isolated atomic manganese: Site size and orbital occupancy dependence of crystal field splitting

Collier

Byrne

Murray

et al. 2010

The Journal of Chemical Physics

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“…The La-N bond is more covalent than the Ca-N bond; however, the Al-N bond is less covalent than the Si-N bond with the introduction of the LaAl 6+ pair into the CaAlSiN 3 (x = 0) sample. Based on the radius, the Eu 2+ cation [ [6] r(Eu…”

Section: +mentioning

confidence: 99%

“…Using Equation (1) and the luminescent probability W, luminescent efficiency η can be expressed using the following formula [6,7]:…”

Section: Introductionmentioning

confidence: 99%

“…The excited electrons can relax through radiative (Figure 1b; dotted green line) and nonradiative (Figure 1b; gray line) processes, such as photon emission and collisional quenching, respectively. According to the configurational coordinate model, the transition probability (N) of a nonradiative relaxation process can be expressed as follows [6,7]:…”

Section: Introductionmentioning

confidence: 99%

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Thermal effects in (oxy)nitride phosphors

Lin

Liu

2014

J Sol State Light

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Technologies that control the chemical composition of white lighting-emitting diodes are promising means to enhance thermal properties and renew spectra generation. Although (oxy)nitride red phosphors have been available for more than a decade, the drawbacks of these devices still evidently remain with respect to the local environments of activators in a variety of nitridosilicates. Thermal effects, such as, thermal quenching, thermal ionization, and thermal degradation, are technologically important parameters that determine product reliability. In recent years, red phosphors, which can alter novel complexes with particular wavelengths, have been easily synthesized and used to minimize losses during energy conversion process. Silicon nitride ceramics contain a more highly condensed network compared with silicate because of the higher degree of cross-linking, edge-sharing SiN 4 tetrahedron, and more covalent and stronger crystal field splitting. To provide a reasonable explanation for the relationship between photoluminescence and structure, an empirical model has been proposed, in which the changes in the chemical environment of the activators are attributed to strains resulting from atom displacements. In addition, the development of high-efficiency and cost-effective light-emitting diodes based on these luminescent materials has difficult challenges.

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“…Excellent reviews are available describing 4f wavefunctions and their interaction with the lattice (11)(12)(13).…”

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confidence: 99%