The luminescence of basic magnesium arsen ate activated by manganese

Travniçek, M.; Kröger, F. A.; Botden, Th. P.J.; Zalm, P. C.

doi:10.1016/s0031-8914(52)80139-9

Cited by 26 publications

(5 citation statements)

References 8 publications

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“…Some Mn 4+ -doped oxides, however, have much higher quenching temperatures than Mn 4+ -doped fluorides. For example, Mg 4 GeO 6 :Mn 4+ , Mg 28 Ge 7.5 O 38 F 10 :Mn 4+ , and Mg 6 As 2 O 11 :Mn 4+ have a T ½ of ~700 K 55–57 , while K 2 TiF 6 :Mn 4+ and other Mn 4+ -doped fluorides have a T ½ of 400–500 K (see also Tables 1 and 2). No correlation is found between the Mn 4+ luminescence quenching temperature and the energy of the CT transition (see Supplementary Information for an overview and a plot of quenching temperatures and CT energies).…”

Section: Resultsmentioning

confidence: 99%

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

2018

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Red-emitting Mn4+-doped fluorides are a promising class of materials to improve the color rendering and luminous efficacy of white light-emitting diodes (w-LEDs). For w-LEDs, the luminescence quenching temperature is very important, but surprisingly no systematic research has been conducted to understand the mechanism for thermal quenching in Mn4+-doped fluorides. Furthermore, concentration quenching of the Mn4+ luminescence can be an issue but detailed investigations are lacking. In this work, we study thermal quenching and concentration quenching in Mn4+-doped fluorides by measuring luminescence spectra and decay curves of K2TiF6:Mn4+ between 4 and 600 K and for Mn4+ concentrations from 0.01% to 15.7%. Temperature-dependent measurements on K2TiF6:Mn4+ and other Mn4+-doped phosphors show that quenching occurs through thermally activated crossover between the 4T2 excited state and 4A2 ground state. The quenching temperature can be optimized by designing host lattices in which Mn4+ has a high 4T2 state energy. Concentration-dependent studies reveal that concentration quenching effects are limited in K2TiF6:Mn4+ up to 5% Mn4+. This is important, as high Mn4+ concentrations are required for sufficient absorption of blue LED light in the parity-forbidden Mn4+ d–d transitions. At even higher Mn4+ concentrations (>10%), the quantum efficiency decreases, mostly due to direct energy transfer to quenching sites (defects and impurity ions). Optimization of the synthesis to reduce quenchers is crucial for developing more efficient highly absorbing Mn4+ phosphors. The present systematic study provides detailed insights into temperature and concentration quenching of Mn4+ emission and can be used to realize superior narrow-band red Mn4+ phosphors for w-LEDs.

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Section: Resultsmentioning

confidence: 99%

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

2018

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“…This principle of taking an excess of the basic constituent which is comparatively harmless, in order to suppress the presence of deleterious reaction products or unreacted basic constituents, is quite generally applied in preparative phosphor chemistry [see, for example ref. (23)(24)(25)(26)].…”

Section: Ternary Systemsmentioning

confidence: 99%

Ultraviolet Fluorescence of Some Ternary Silicates Activated with Lead

Klasens

Hoekstra

Cox

1957

J. Electrochem. Soc.

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The fluorescence and phase diagrams of the following Pb‐activated ternary systems were investigated: normalSrO‐normalMgO‐SiO2 ; normalSrO‐normalZnO‐SiO2 ; normalBaO‐normalMgO‐SiO2 ; normalBaO‐normalZnO‐SiO2 . Eleven new ternary silicates were identified, some of which proved to be very good base materials for Pb‐activated phosphors with peak emissions ranging from 3000 to 4000Aå.

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“…The matrix used in this investigation contains considerably more Li atoms than Klasens's phosphor ( 23), yet has a much simpler x-ray powder diffraction pattern than 6MgO.As~O~ (24). The diffraction pattern also differs from that of magnesium metaantimonate, MgSb~OG, which is formed by the prefiring of MgO and Sb~O~ and ultimately converts to the final phosphor matrix, MgoLioSb~O~, by reacting with the excess MgO and added LiOH during the final firing.…”

Section: Nature Of the Matrixmentioning

confidence: 99%

Magnesium Lithium Antimonate Phosphors

Mooney

1961

J. Electrochem. Soc.

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The preparation, purification, and thermal decomposition of silane, SiR, were investigated for the purpose of preparing high-purity silicon. Quantitative yields of silane were obtained by the reduction of silicon tetrachloride with lithium aluminum hydride. Variables in the thermal decomposition of silane were evaluated with regard to purity of the elemental silicon produced and the efficiency of dissociation and deposition rate. Silane was dissociated on an inductively heated single crystal silicon substrate to yield high-purity silicon. Neutron activation analyses for microcrystalline high-purity silicon as deposited are given. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 169.230.243.252 Downloaded on 2015-04-10 to IP

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The luminescence of basic magnesium arsen ate activated by manganese

Cited by 26 publications

References 8 publications

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

Ultraviolet Fluorescence of Some Ternary Silicates Activated with Lead

Magnesium Lithium Antimonate Phosphors

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