Near UV-pumped green-emitting Na3(Y,Sc)Si3O9:Eu2+ phosphor for white-emitting diodes

Xia, Zhiguo; Zhou, Jun; Mao, Zhiyong

doi:10.1039/c3tc30897a

Cited by 163 publications

(60 citation statements)

References 32 publications

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“…To obtain a more comprehensive picture of the thermal quenching behavior and estimate the value of its activation energy ( E a ), the Arrhenius equation (Eq. (1)) was employed as follows [26–28]:where I 0 and I T are the intensities of the initial and final temperatures, respectively; c is the rate constant; E a is the activation energy; and k is the Boltzmann constant (8.629 × 10 −5 eV K −1 ). Figure 8 shows the In( I 0 / I T − 1) vs 10,000 / T relationship lines for the emission band centered at 697 nm for ZGGO:Cr 3+ and ZGGO:Cr 3+ ,Eu 3+ .…”

Section: Resultsmentioning

confidence: 99%

Near Infrared-Emitting Cr3+/Eu3+ Co-doped Zinc Gallogermanate Persistence Luminescent Nanoparticles for Cell Imaging

Zhang

Zhu

2018

Nanoscale Res Lett

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Near infrared (NIR)-emitting persistent luminescent nanoparticles have been developed as potential agents for bioimaging. However, synthesizing uniform nanoparticles with long afterglow for long-term imaging is lacking. Here, we demonstrated the synthesis of spinel structured Zn3Ga2Ge2O10:Cr3+ (ZGGO:Cr3+) and Zn3Ga2Ge2O10:Cr3+,Eu3+ (ZGGO:Cr3+,Eu3+) nanoparticles by a sol-gel method in combination with a subsequent reducing atmosphere-free calcination. The samples were investigated via detailed characterizations by combined techniques of XRD, TEM, STEM, selected area electron diffraction, photoluminescence excitation (PLE)/photoluminescence (PL) spectroscopy, and temperature-dependent PL analysis. The single-crystalline nanoparticles are homogeneous solid solution, possessing uniform cubic shape and lateral size of ~ 80–100 nm. Upon UV excitation at 273 nm, ZGGO:Cr3+,Eu3+ exhibited a NIR emission band at 697 nm (2E → 4A2 transition of distorted Cr3+ ions in gallogermanate), in the absence of Eu3+ emission. NIR persistent luminescence of the sample can last longer than 7200 s and still hold intense intensity. Eu3+ incorporation increased the persistent luminescence intensity and the afterglow time of ZGGO:Cr3+, but it did not significantly affect the thermal stability. The obtained ZGGO:Cr3+,Eu3+-NH2 nanoparticles possessed an excellent imaging capacity for cells in vitro.

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Section: Resultsmentioning

confidence: 99%

Near Infrared-Emitting Cr3+/Eu3+ Co-doped Zinc Gallogermanate Persistence Luminescent Nanoparticles for Cell Imaging

Zhang

Zhu

2018

Nanoscale Res Lett

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“…The quenching temperature T q , at which the emission intensity is reduced to 50 %, is 170°C. Xia et al [130] have reported on the phosphor Na 3 Y 1-x Sc x Si 3 O 9 :Eu 2? .…”

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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“…In recent years, white light-emitting diodes (w-LEDs) have attracted extensive attention and become widely available in lighting and display fields because of their outstanding features such as higher rendering index (CRI), higher luminosity efficiency, longer lifetime and lower energy consumption [1,2]. Currently available commercial white LEDs can be fabricated using a blue InGaN LED chip in combination with a yellow phosphor of cerium (III)-doped yttrium aluminum garnet (YAG:Ce 3 þ ) [3].…”

Section: Introductionmentioning

confidence: 99%