Growth and spectroscopic characteristics of Cr3+:CsAl(MoO4)2 crystal

Wang, Guojian; Zhang, Lizhen; Lin, Zhoubin; Wang, Guofu

doi:10.1016/j.jallcom.2009.09.076

Cited by 21 publications

(14 citation statements)

References 24 publications

(22 reference statements)

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“…This value represents an “effective” absorption cross-section, affected by scattering of excitation light in the phosphor layer and reflection on the substrate which can enhance the electromagnetic field strength experienced by Mn 4+ . Indeed, σ eff is an order of magnitude higher than the absorption cross sections of σ = 0.3–1.7 × 10 –19 cm 2 measured for the same 4 A 2 → 4 T 2 absorption transition in the iso-electronic luminescent center Cr 3+ in various crystals. − Using the simple two-level model of Figure d, we can estimate the steady-state excited-state population where subscript “ss” denotes “steady-state”. The pie charts of Figure b show the calculated steady-state populations for two values of I exc we used in the experiment.…”

Section: Resultsmentioning

confidence: 96%

Saturation Mechanisms in Common LED Phosphors

Haar¹,

Tachikirt²,

Berends³

et al. 2021

ACS Photonics

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Commercial lighting for ambient and display applications is mostly based on blue light-emitting diodes (LEDs) combined with phosphor materials that convert some of the blue light into green, yellow, orange, and red. Not many phosphor materials can offer stable output under high incident light intensities for thousands of operating hours. Even the most promising LED phosphors saturate in high-power applications, that is, they show decreased light output. The saturation behavior is often poorly understood. Here, we review three popular commercial LED phosphor materials, Y 3 Al 5 O 12 doped with Ce 3+ , CaAlSiN 3 doped with Eu 2+ , and K 2 SiF 6 doped with Mn 4+ , and unravel their saturation mechanisms. Experiments with square-wave-modulated laser excitation reveal the dynamics of absorption and decay of the luminescent centers. By modeling these dynamics and linking them to the saturation of the phosphor output intensity, we distinguish saturation by ground-state depletion, thermal quenching, and ionization of the centers. We discuss the implications of each of these processes for LED applications. Understanding the saturation mechanisms of popular LED phosphors could lead to strategies to improve their performance and efficiency or guide the development of new materials.

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Section: Resultsmentioning

confidence: 96%

Saturation Mechanisms in Common LED Phosphors

Haar¹,

Tachikirt²,

Berends³

et al. 2021

ACS Photonics

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“…[15][16][17][18][19] The diversity of crystal structure and spectroscopic properties inspired the study on Cr 3+ doped crystals. Crystal growth, optical properties and crystal eld characterization of Cr 3+ :RAl(MoO 4 ) 2 (R ¼ K and Cs) 20,21 and Cr 3+ :NaAl(WO 4 ) 2 22,23 were studied. E. Cavalli et al reported the optical properties and energy levels of the Cr 3+ ions in MWO 4 (M ¼ Mg, Zn, Cd) and MgMoO 4 crystals.…”

Section: Introductionmentioning

confidence: 99%

Crystal growth, spectroscopic properties and energy levels of Cr³⁺:Li₂Mg₂(WO₄)₃: a candidate for broadband laser application

Wang

et al. 2014

RSC Adv.

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“…20,49 The sixfold coordinated Te VI (3) site is in a distorted octahedral geometry. The Te VI (3)−O bond distances exhibit three short (from 1.860 (9) 1d). 50 In the latter structure, these anion fragments also play a role of linkage to cross-connect adjacent lanthanum−tellurium layers.…”

Section: Resultsmentioning

confidence: 99%

Thorium Chemistry in Oxo-Tellurium System under Extreme Conditions

et al. 2017

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Through the use of a high-temperature/high-pressure synthesis method, four thorium oxo-tellurium compounds with different tellurium valence states were isolated. The novel inorganic phases illustrate the intrinsic complexity of the actinide tellurium chemistry under extreme conditions of pressure and temperature. ThTeO is the first instance of a mixed-valent oxo-tellurium compound, and at the same time, Te exhibits three different coordination environments (TeO, TeO, and TeO) within a single structure. These three types of Te polyhedra are further fused together, resulting in a [TeO] fragment. NaTh(TeO) and KTh(TeO) are the first alkaline thorium tellurates described in the literature. Both compounds are constructed from ThO tricapped trigonal prisms and TeO octahedra. NaTh(TeO) is a three-dimensional framework based on ThO and TeO dimers, while KTh(TeO) contains tungsten oxide bronze like Te layers linked by ThO polyhedra. The structure of β-Th(TeO)(SO) is built from infinite thorium chains cross-linked by TeO and SO anions. Close structural analysis suggests that β-Th(TeO)(SO) is highly related to the structure of α-Th(SeO). Additionally, the Raman spectra are recorded and the characteristic peaks are assigned based on a comparison of reported tellurites or tellurates.

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Growth and spectroscopic characteristics of Cr3+:CsAl(MoO4)2 crystal

Cited by 21 publications

References 24 publications

Saturation Mechanisms in Common LED Phosphors

Saturation Mechanisms in Common LED Phosphors

Crystal growth, spectroscopic properties and energy levels of Cr³⁺:Li₂Mg₂(WO₄)₃: a candidate for broadband laser application

Thorium Chemistry in Oxo-Tellurium System under Extreme Conditions

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Growth and spectroscopic characteristics of Cr3+:CsAl(MoO4)2 crystal

Cited by 21 publications

References 24 publications

Saturation Mechanisms in Common LED Phosphors

Saturation Mechanisms in Common LED Phosphors

Crystal growth, spectroscopic properties and energy levels of Cr3+:Li2Mg2(WO4)3: a candidate for broadband laser application

Thorium Chemistry in Oxo-Tellurium System under Extreme Conditions

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Crystal growth, spectroscopic properties and energy levels of Cr³⁺:Li₂Mg₂(WO₄)₃: a candidate for broadband laser application