The energy transfer from Eu2+ to Tb3+ in Ca10K(PO4)7 and its application in green light emitting diode

Wang, Jing; Zhang, Zhiyang; Zhang, Mei; Zhang, Qiuhong; Su, Qiang; Tang, Jinke

doi:10.1016/j.jallcom.2008.09.088

Cited by 54 publications

(19 citation statements)

References 21 publications

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“…And many kinds of materials with different cations substituting in the initialˇ-Ca 3 (PO 4 ) 2 have served as the base for the crystallochemical design of compounds with ferroelectric, nonlinear-optical and ion-conductive properties [14,15]. To the best of our knowledge, the ultraviolet (UV) optical properties of CKP:Eu 2+ , Tb 3+ have been investigated [16]. However, the photoluminescence (PL) properties of RE 3+ -doped CKP in VUV region have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Luminescence properties of Ca10K(PO4)7:RE3+ (RE=Ce, Tb, Dy, Tm and Sm) under vacuum ultraviolet excitation

Zhang

Wang

Wen

et al. 2011

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Luminescence properties of Ca10K(PO4)7:RE3+ (RE=Ce, Tb, Dy, Tm and Sm) under vacuum ultraviolet excitation

Zhang

Wang

Wen

et al. 2011

Journal of Alloys and Compounds

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“…In comparison with w‐LEDs fabricated with the blue chip, the near‐UV LED chip‐based w‐LEDs have high color stability because all colors are generated by the phosphors. Thus, the near‐UV‐based pc‐LED is expected to have great potential in the field of SSL, when comparing with blue LED‐based pc‐LED 15–17 . Moreover, poor luminescent efficiency is attributed, while producing white light by combining two or three phosphors with near‐UV LED chip, due to reabsorption of emission colors 18,19 .…”

Section: Introductionmentioning

confidence: 99%

White Light Emission from NaCaPO₄:Dy³⁺ Phosphor for Ultraviolet‐Based White Light‐Emitting Diodes

Ratnam

Jayasimhadri

Jang

et al. 2010

Journal of the American Ceramic Society

162

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Trivalent dysprosium (Dy3+)‐doped NaCaPO4 phosphors were synthesized by using a conventional solid‐state reaction technique. The phase and the structure of the as‐prepared powders were characterized by using X‐ray diffraction analysis and revealed that the pure NaCaPO4 formed with orthorhombic structure. The photoluminescence excitation and emission spectra were measured to characterize the luminescent properties of NaCaPO4:Dy3+ phosphors. Sharp emission peaks were observed at 482 nm (blue) and 575 nm (yellow) upon 367 nm excitation, which are attributed to the characteristic 4F9/2→6HJ (J=15/2 and 13/2) transitions of trivalent Dy3+ ions, respectively. The suitable control of the blue/yellow intensity ratio is expected to realize a white luminescent system. The lifetime of 4F9/2 level was measured by exciting Dy3+ ions at 355 nm excitation. The chromaticity coordinates were calculated from the emission spectra and analyzed with Commission International de I'Eclairage (CIE) programs and diagrams. The CIE color coordinates fall in the white light region under different ultraviolet (UV) excitations. These results indicate that NaCaPO4:Dy3+ phosphor could be a potential candidate for UV‐based white light‐emitting diodes.

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“…2b. Two parameters are useful to define the brightness and the color emitted by Top Curr Chem (Z) (2016) 374: 21 Page 3 of 47 21 a pcWLED, the luminous efficacy (LE) and the color rendering index (CRI). The LE expresses how well a light source produces visible light, whereas the CRI measures quantitatively the ability of a light source to reproduce the colors of various objects Figure 2e shows the coordinates of emitted visible light from NUV-and blue-LED based pcWLEDs in the CIE 1931 chromaticity diagram, where the correlated color temperature (CCT) is indicated along the blackbody locus.…”

Section: Phosphor Converted White Light Emitting Diodesmentioning

confidence: 99%

“…. These phenomena have been studied in the double phosphates Ca 10 K(PO 4 ) 7 [21] and LiSrPO 4 [22] 4 ), so that the broad luminescence of Eu 2? is still present in the spectra in the blue region.…”

Section: Green Phosphors-oxide Hosts: Phosphates Silicatesmentioning

confidence: 99%

Inorganic Phosphor Materials for Lighting

2016

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This chapter addresses the development of inorganic phosphor materials capable of converting the near UV or blue radiation emitted by a light emitting diode to visible radiation that can be suitably combined to yield white light. These materials are at the core of the new generation of solid-state lighting devices that are emerging as a crucial clean and energy saving technology. The chapter introduces the problem of white light generation using inorganic phosphors and the structureproperty relationships in the broad class of phosphor materials, normally containing lanthanide or transition metal ions as dopants. Radiative and non-radiative relaxation mechanisms are briefly described. Phosphors emitting light of different colors (yellow, blue, green, and red) are described and reviewed, classifying them in different chemical families of the host (silicates, phosphates, aluminates, borates, and non-oxide hosts). This research field has grown rapidly and is still growing, but the discovery of new phosphor materials with optimized properties (in terms of emission efficiency, chemical and thermal stability, color, purity, and cost of fabrication) would still be of the utmost importance.

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The energy transfer from Eu2+ to Tb3+ in Ca10K(PO4)7 and its application in green light emitting diode

Cited by 54 publications

References 21 publications

Luminescence properties of Ca10K(PO4)7:RE3+ (RE=Ce, Tb, Dy, Tm and Sm) under vacuum ultraviolet excitation

Luminescence properties of Ca10K(PO4)7:RE3+ (RE=Ce, Tb, Dy, Tm and Sm) under vacuum ultraviolet excitation

White Light Emission from NaCaPO₄:Dy³⁺ Phosphor for Ultraviolet‐Based White Light‐Emitting Diodes

Inorganic Phosphor Materials for Lighting

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The energy transfer from Eu2+ to Tb3+ in Ca10K(PO4)7 and its application in green light emitting diode

Cited by 54 publications

References 21 publications

Luminescence properties of Ca10K(PO4)7:RE3+ (RE=Ce, Tb, Dy, Tm and Sm) under vacuum ultraviolet excitation

Luminescence properties of Ca10K(PO4)7:RE3+ (RE=Ce, Tb, Dy, Tm and Sm) under vacuum ultraviolet excitation

White Light Emission from NaCaPO4:Dy3+ Phosphor for Ultraviolet‐Based White Light‐Emitting Diodes

Inorganic Phosphor Materials for Lighting

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Product

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White Light Emission from NaCaPO₄:Dy³⁺ Phosphor for Ultraviolet‐Based White Light‐Emitting Diodes