Luminescence properties of Ce3+-activated alkaline earth silicon nitride M2Si5N8 (M=Ca, Sr, Ba) materials

Li, Y.Q.; With, G. de; Hintzen, H. T.

doi:10.1016/j.jlumin.2005.03.014

Cited by 154 publications

(106 citation statements)

References 18 publications

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“…This can be provided by intrinsic defects, such as vacancies, but this often leads to more significant concentration quenching, with clustering of Ce 3+ ions and correlated red shift of the emission spectrum. Codoping with monovalent cations can improve the incorporation in this case, by restoring charge balance [95].…”

Section: Hostmentioning

confidence: 99%

Selecting Conversion Phosphors for White Light-Emitting Diodes

Smet

Parmentier

Poelman

2011

J. Electrochem. Soc.

703

501

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Light emitting diodes (LEDs) are on the verge of a breakthrough in general lighting, due to their rapidly improving efficiency. Currently, white LEDs with high color rendering are mainly based on wavelength conversion by one or more phosphor materials. This Review first describes how to quantify the quality of a light source, discussing the color rendering index (CRI) and alternative color quality indices. Then, six main criteria are identified and discussed, which should be fulfilled by a phosphor candidate to be considered for actual application in LEDs. These criteria deal with the shape and position of the emission and the excitation spectra, the thermal quenching behavior, the quantum efficiency, the chemical and thermal stability and finally with the occurrence of saturation effects. Based on these criteria, the most common dopant ions (broad-band emitting Eu AbstractLight emitting diodes (LEDs) are on the verge of a breakthrough in general lighting, due to their rapidly improving efficiency. Currently, white LEDs with high color rendering are mainly based on wavelength conversion by one or more phosphor materials. This Review first describes how to quantify the quality of a light source, discussing the color rendering index (CRI) and alternative color quality indices. Then, six main criteria are identified and discussed, which should be fulfilled by a phosphor candidate to be considered for actual application in LEDs. These criteria deal with the shape and position of the emission and the excitation spectra, the thermal quenching behavior, the quantum efficiency, the chemical and thermal stability and finally with the occurrence of saturation effects. Based on these criteria, the most common dopant ions (broad-band emitting Eu

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Section: Hostmentioning

confidence: 99%

Selecting Conversion Phosphors for White Light-Emitting Diodes

Smet

Parmentier

Poelman

2011

J. Electrochem. Soc.

703

501

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“…The charge compensation model is an important theory for explaining the reduction of Eu 3+ to Eu 2+ in Ba 0.79 Al 10.9 O 17.14 :xEu in air [29][30][31]. It is known that the Eu 3+ ions occupy the Ba 2+ sites in a non-equivalent compensation way, and every three Ba 2+ ions are substituted by two Eu 3+ ions for balancing the charge neutrality.…”

Section: Self-reduction Of Eumentioning

confidence: 99%

Color tunable Ba0.79Al10.9O17.14:xEu phosphor prepared in air via valence state control

et al. 2017

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A series of luminescent Ba 0.79 Al 10.9 O 17.14 :xEu (x = 0.005-0.12) phosphors were prepared by high-temperature solid-state reaction in air atmosphere. The coexistence of Eu 2+ and Eu 3+ was observed and verified by photoluminescence (PL) and photoluminescence excitation (PLE) spectra, X-ray photoelectron spectra (XPS), and diffuse reflection spectra. The band emission peaking at 430 nm was assigned to 4F 6 5D-4F 7 transition of Eu 2+ , and another four emissions peaking at 589, 619, 655, and 704 nm were attributed to 4F-4F transitions of 5 D 0 -7 F J (J = 1, 2, 3, 4) of Eu 3+ . The related mechanism of self-reduction was discussed in detail. The color of the Ba 0.79 Al 10.9 O 17.14 :xEu phosphors could be shifted from blue (0.23, 0.10) to red (0.42, 0.27) by doping Li + ions, and the temperature dependence properties were investigated.

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“…Upon irradiation at different wavelengths within the excitation spectrum, the emission spectra put up similar emission of Eu 2+ in peak shape and position, indicating the occurrence of energy transfer between the base material and the Eu 2+ activators. This intense broad excitation band located at the near-UV and visible light spectral range provides the basis for developing this kind of phosphors for lighting-emitting diode (LED) conversion applications [11][12][13]. …”

Section: Characterizationmentioning

confidence: 99%