Tunable Eu2+ emission in KxNa1−xLuS2 phosphors for white LED application

Havlák, Lubomír; Jarý, V.; Bárta, Jan; Buryi, M.; Rejman, Martin; Laguta, V. V.; Nikl, M.

doi:10.1016/j.matdes.2016.05.123

Cited by 22 publications

(20 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No significant elemental impurities were detected. The signal ratio K/S for the fraction of big crystals corresponded very well with the experimentally observed dependence for K 1-x Na x LuS 2 on the melt composition obtained in our previous work, 26 whereas the small fraction consistently featured a higher K/S value (see Table II). Thus, the smaller crystals probably contain slightly elevated concentrations of K (on average) in their structure with respect to Na.…”

Section: Phosphors Compositionsupporting

confidence: 89%

“…As shown in Ref. 26, there is an abrupt change in lattice parameter c in this area (the inflexion point of the experimental sigmoidal curve). This broadening most probably indicates a wide variation of lattice parameters in different crystals or a large microstructural strain inside a single crystal.…”

Section: Phosphors Compositionsupporting

confidence: 57%

“…29 This work introduces tunable white light source with tunable CCT temperature based on two different excitation diodes and only single phosphor derived from K x Na 1-x LuS 2 :Eu 2+ (x = 0-1) single crystalline sulfides, whose optical properties are described in great details in Ref. 26.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Circadian Light Source Based on K_xNa_1-xLuS₂:Eu²⁺ Phosphor

Jarý¹,

Havlák²,

Bárta³

et al. 2017

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

The presented work describes a functional demonstration device representing the source of white light with tunable color correlated temperature. Tunability is achieved by using two different kinds of excitation diodes (nearUV and blue) in combination with a proper K x Na 1-x LuS 2 :Eu 2+ phosphor. Its luminescence due to the Eu 2+ 5d-4f allowed transition covers a broad emission region in visible range under both nearUV and blue excitations. The possibility to change the intensity ratio of the excitation diodes yields the changes of the output color correlated temperature. These changes are clearly demonstrated by shifts in the CIE color space; light quality is also quantified and discussed using CRI (color rendering index) and CQS (color quality scale) metrics.

show abstract

Section: Phosphors Compositionsupporting

confidence: 89%

Section: Phosphors Compositionsupporting

confidence: 57%

See 1 more Smart Citation

Circadian Light Source Based on K_xNa_1-xLuS₂:Eu²⁺ Phosphor

Jarý¹,

Havlák²,

Bárta³

et al. 2017

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…High R&D activity in the field of inorganic scintillators employed for ionizing radiation detection has very long history, and has been triggered mainly by the pressing needs of modern medical imaging, high energy physics, homeland security and environmental applications during the last two decades [1,2]. Therefore, a number of new or improved scintillators or phosphors such as Ce and Pr doped single crystals, novel semiconductor composites, metal-organic frameworks and phase-separated materials systems, have been discovered and studied in depth [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Composition and properties tailoring in Mg2+ codoped non-stoichiometric LuAG:Ce,Mg scintillation ceramics

Liu

Mareš

Babin

et al. 2017

Journal of the European Ceramic Society

View full text Add to dashboard Cite

A comprehensive study of the optical, radioluminescence and scintillation properties of both the Lu 3+ rich and Lu 3+ deficient non-stoichiometric Lu 3+x AG:Ce,Mg (Lu 3+x Al 5 O 12 :Ce,Mg, x =-4,-1, +1 and +4 at.%) ceramics are performed, completed further by the microstructure and defects characterization. Small deviation from the stoichiometric composition as well as Mg 2+ codoping play a crucial role in ceramic transparency, radioluminescence intensity and the timing characteristics of scintillation response. The Lu Al antisite defects could be suppressed efficiently by controlling Lu 3+ content below stoichiometry of LuAG host. MgO (Mg 2+ ions) as effective sintering aids, can improve both the optical quality and scintillation performance (light yield, scintillation decay times and the ratio of fast decay components). We generally discuss the composition dependence of defects and properties tailoring. We also performed the systematic comparative study with the

show abstract

“…As a kind of a novel solid cold-light source, white light-emitting diodes (LEDs) have certainly been well-received thanks to a series of advantages such as large brightness, low energy consumption and good response characteristic [1][2][3][4][5][6]. Thus, it can be suggested that the white LEDs will become a new generation lighting source [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Bi³⁺content on photoluminescence of InNbO₄:Eu³⁺,Bi³⁺for white light-emitting diodes

Tang

Shao

et al. 2017

Materials Science-Poland

View full text Add to dashboard Cite

A series of red-emitting phosphors InNbO 4 :Eu 3+ ,Bi 3+ was prepared by a high temperature solid-state reaction. The structure, size distribution and luminescence properties of the phosphors were respectively characterized by X-ray diffraction (XRD), laser particle size and molecular fluorescence spectrometer. The XRD results indicate that the phase-pure samples have been obtained and the crystal structure of the host has not changed under the Eu 3+ and Bi 3+ co-doping. The test of size distribution shows that the phosphor has a normal size distribution. The excitation spectra illustrate that the dominant sharp peaks are located at 394 nm ( 7 F 0 → 5 L 6 ) and 466 nm ( 7 F 0 → 5 D 2 ). Meanwhile, the emission spectra reveal that the phosphors excited by the wavelength of 394 nm or 466 nm have an intense red-emission line at 612 nm owing to the 5 D 0 → 7 F 2 transition of Eu 3+ . Bi 3+ doping has not changed the peak positions except the photoluminescence intensity. The emission intensity is related to Bi 3+ concentration, and it is up to the maximum when the Bi 3+ -doping concentration is 4 mol%. Due to good photoluminescence properties of the phosphor, the InNbO 4 :0.04Eu 3+ ,0.04Bi 3+ may be used as a red component for white light-emitting diodes.

show abstract

Tunable Eu2+ emission in KxNa1−xLuS2 phosphors for white LED application

Cited by 22 publications

References 51 publications

Circadian Light Source Based on K_xNa_1-xLuS₂:Eu²⁺ Phosphor

Circadian Light Source Based on K_xNa_1-xLuS₂:Eu²⁺ Phosphor

Composition and properties tailoring in Mg2+ codoped non-stoichiometric LuAG:Ce,Mg scintillation ceramics

Influence of Bi³⁺content on photoluminescence of InNbO₄:Eu³⁺,Bi³⁺for white light-emitting diodes

Contact Info

Product

Resources

About

Tunable Eu2+ emission in KxNa1−xLuS2 phosphors for white LED application

Cited by 22 publications

References 51 publications

Circadian Light Source Based on KxNa1-xLuS2:Eu2+ Phosphor

Circadian Light Source Based on KxNa1-xLuS2:Eu2+ Phosphor

Composition and properties tailoring in Mg2+ codoped non-stoichiometric LuAG:Ce,Mg scintillation ceramics

Influence of Bi3+content on photoluminescence of InNbO4:Eu3+,Bi3+for white light-emitting diodes

Contact Info

Product

Resources

About

Circadian Light Source Based on K_xNa_1-xLuS₂:Eu²⁺ Phosphor

Circadian Light Source Based on K_xNa_1-xLuS₂:Eu²⁺ Phosphor

Influence of Bi³⁺content on photoluminescence of InNbO₄:Eu³⁺,Bi³⁺for white light-emitting diodes