Enhanced Luminescence of <scp><scp>Ca</scp></scp>14<scp><scp>Mg</scp></scp>2<scp><scp>Si</scp></scp>8<scp><scp>O</scp></scp>28+δ<scp><scp>N</scp></scp>4−δ:<scp><scp>Eu</scp></scp>2+Phosphors by Codoping <scp><scp>Ce</scp></scp>3+, <scp><scp>Mn</scp></scp>2+ for White <scp>LED</scp>s and Their Energy‐Transfer Mechanism

Unithrattil, Sanjith; Lee, Kyoung Hwa; Im, Won Bin

doi:10.1111/jace.12722

Cited by 20 publications

(9 citation statements)

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“…The diffraction patterns of all samples were similar to that of the initial model of the CMS host lattice. The introduction of La to the Ca 2+ sites did not induce any impurity phases for La contents of 0.1 to 0.4 molar content, and all synthesized samples have a single orthorhombic structure (space group: Pnn 2) . The panel at the bottom of Fig.…”

Section: Resultsmentioning

confidence: 97%

“…and Table . Although we obtained XRD patterns for the LaCMSN:Eu 2+ samples, NPD patterns were additionally collected because O 2− and N 3− have similar X‐ray scattering factors, making it difficult to distinguish between O 2− and N 3− in the XRD data . Also, from the Rietveld refinement results, no impurity phases were identified in any of the samples, regardless of the La content.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, many studies have been conducted to improve the color rendering properties of phosphor‐converted (pc) WLEDs . Because the color rendering properties of pc WLEDs depend on the relative intensity of the emissions of the LED and phosphor, the development of new phosphor materials with intense luminescence and high stability is crucial for generating robust white light during the operation of WLEDs.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Optical Properties of Bredigite‐Structure Ca_13.7Eu_0.3Mg₂[SiO₄]₈ Phosphor: Effective Eu Reduction by La Co‐Doping

et al. 2015

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A green phosphor, La 0.4 Ca 13.3 Eu 0.3 Mg 2 Si 8 O 31.6+d N 0.4d (LaCMSN:Eu 2+ ), was prepared by a solid-state reaction and an efficient green emission was observed at 506 nm under nearultraviolet (NUV) excitation. The structural and optical properties of LaCMSN:Eu 2+ phosphors as well as their thermal quenching were investigated. The partial substitution of La 3+ and N 3in Ca 13.7 Eu 0.3 Mg 2 Si 8 O 32 led to a considerable enhancement in the peak emission intensity by as much as 194%. This demonstrates not only that the total number of Eu 2+ activators increased, but also that the probability of a nonradiative transition between Eu 2+ and Eu 3+ could be reduced as the increase in concentration of the former is at the expense of the later. The white light-emitting diode (LED) was fabricated using phosphor with a NUV LED chip. The LED showed warm white light with an excellent color rendering index of 91. The LaCMSN:Eu 2+ is thus a potential greenemitting phosphor for white LEDs.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Optical Properties of Bredigite‐Structure Ca_13.7Eu_0.3Mg₂[SiO₄]₈ Phosphor: Effective Eu Reduction by La Co‐Doping

et al. 2015

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“…One possibility is that energy transfer from Ce 3+ to Eu 2+ may exist in the tri‐doped Ba 2 P 2 O 7 system. Therefore, the sensitizer Ce 3+ provides more efficient energy transfer to the activator Eu 2+ , which enhances the emission intensity of Eu 2+ ion as a luminescence center . The other possibility is that this phenomenon results from the doping of Ce 3+ ions, and changes the crystal field environment and affects the energy absorption as well as the transition radiation of Eu 2+ .…”

Section: Resultsmentioning

confidence: 99%

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

et al. 2017

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Abstractpoor color rendering index and low stability of CCT. [1,4] Given that issue, it is necessary to explore single-phase white emissive phosphors for application in w-LEDs.Numerous efforts have previously been made to develop codoped single-phase white-emitting phosphors. [5,6] However, with the tri-doped phosphor it is easier to achieve tri-chromatic (RGB) emission with complete coverage when compared with co-doped phosphors. It is well known that the mixture of RGB emissions is more beneficial to generate an ideal warm white-light emission according to trichromatic theory. [7] Hence, more researchers have devoted themselves to developing the more complex tri-doped single-phase white-emitting phosphors. For example, Jiang and colleagues [8] It is a known reality that most phosphors are prepared via a conventional solid-state route, which has unavoidable disadvantages such as high synthesis temperature, nonhomogeneous mixtures and uncontrollable morphology. In particular, the obtained particles are very large with sizes in the range 1-10 μm. [9,10] In recent years, more researchers have focused on the co-precipitation method, which can overcome the above disadvantages and obtain nanophosphors with excellent luminescence properties. [9][10][11][12][13][14] Among these, Yi and colleagues [15] short, the co-precipitation method is very safe, energy-saving, timesaving option.At present, the most common hosts are aluminate and silicate systems with high stability and high QE. [16] But their synthesis conditions are harsh, in particular the synthesis temperatures are often as high as 1300°C. [17] Other materials, such as tungsten phosphate and rare earth oxides, can be easily synthesized, however they are chemically instable.[18] Barium pyrophosphate is a promising host for luminescent materials due to its low sintering temperature and stability. [18][19][20] Among the trivalent rare earth ions, Tb 3+ ion has been used frequently as the green emission center owing to its predominant 5 D 4 ! 7 F 5 transition with a peak centered at 545 nm. However, because of the forbidden transition and the weak absorption of Tb 3+ ion in the NUV region, the emission efficiency is low. [20,21] As is well known, Ce 3+ and Eu 2+ are often considered as the most important activator and effective sensitizer for Tb 3+ because of their unique electronic energy levels. [22][23][24][25] To the best of our knowledge, the crystal structures and lumines- | CharacterizationThe crystal phase of phosphor sample was analyzed by a SHIMADZU XRD-6000 diffractometer (Shimadzu Co., Japan) with Ni-filtered Cu single-phase. Ba 2 P 2 O 7 crystallized as a hexagonal structure with a space group p-62m and the lattice parameters were determined to be a = b = 9.415Å, c = 7.078Å, the crystal structure diagram of which is presented in Figure 2(a). The hexagonal form of Ba 2 P 2 O 7 signified that the sample host was at a higher temperature phase as σ-Ba 2 P 2 O 7 .Ba ions have two different types of coordination environments, in which one is coordinated b...

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“…Many research studies have been carried out in order to improve the color rendering properties of the white LEDs [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Structural and luminescent properties of red-emitting SrGe 4 O 9 :Mn 4+ phosphors for white light-emitting diodes with high color rendering index

Kim

Jang

Unithrattil

et al. 2016

Journal of Luminescence

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Enhanced Luminescence of Ca₁₄Mg₂Si₈O_28+δN_4−δ:Eu²⁺Phosphors by Codoping Ce³⁺, Mn²⁺ for White LEDs and Their Energy‐Transfer Mechanism

Cited by 20 publications

References 20 publications

Enhanced Optical Properties of Bredigite‐Structure Ca_13.7Eu_0.3Mg₂[SiO₄]₈ Phosphor: Effective Eu Reduction by La Co‐Doping

Enhanced Optical Properties of Bredigite‐Structure Ca_13.7Eu_0.3Mg₂[SiO₄]₈ Phosphor: Effective Eu Reduction by La Co‐Doping

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

Structural and luminescent properties of red-emitting SrGe 4 O 9 :Mn 4+ phosphors for white light-emitting diodes with high color rendering index

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Enhanced Luminescence of Ca14Mg2Si8O28+δN4−δ:Eu2+Phosphors by Codoping Ce3+, Mn2+ for White LEDs and Their Energy‐Transfer Mechanism

Cited by 20 publications

References 20 publications

Enhanced Optical Properties of Bredigite‐Structure Ca13.7Eu0.3Mg2[SiO4]8 Phosphor: Effective Eu Reduction by La Co‐Doping

Enhanced Optical Properties of Bredigite‐Structure Ca13.7Eu0.3Mg2[SiO4]8 Phosphor: Effective Eu Reduction by La Co‐Doping

Luminescent properties of single‐phase Ba2‐x‐1.5y‐1.5zP2O7:xEu2+,yCe3+, zTb3+ phosphors for white light‐emitting diode

Structural and luminescent properties of red-emitting SrGe 4 O 9 :Mn 4+ phosphors for white light-emitting diodes with high color rendering index

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Enhanced Luminescence of Ca₁₄Mg₂Si₈O_28+δN_4−δ:Eu²⁺Phosphors by Codoping Ce³⁺, Mn²⁺ for White LEDs and Their Energy‐Transfer Mechanism

Enhanced Optical Properties of Bredigite‐Structure Ca_13.7Eu_0.3Mg₂[SiO₄]₈ Phosphor: Effective Eu Reduction by La Co‐Doping

Enhanced Optical Properties of Bredigite‐Structure Ca_13.7Eu_0.3Mg₂[SiO₄]₈ Phosphor: Effective Eu Reduction by La Co‐Doping

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode