Blue cathodoluminescence from Ba2B5O9Cl:Eu phosphor thin films on glass substrates

Hao, Jianhua; Cocivera, Michael

doi:10.1063/1.1525879

Cited by 48 publications

(36 citation statements)

References 18 publications

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“…[30][31][32] It was found that the existence of these are restricted by many parameters, including the type of anions in the compound, the site size, and the energy bandgap. [16] However, there is no report about the kind of ultra-broadband and tunable emission found here in Bi-doped nanoporous silica glass in general dense hosts such as crystalline or even glassy materials.…”

Section: Full Papermentioning

confidence: 99%

Multifunctional Bismuth‐Doped Nanoporous Silica Glass: From Blue‐Green, Orange, Red, and White Light Sources to Ultra‐Broadband Infrared Amplifiers

Zhou

Jiang

Zhu

et al. 2008

Adv Funct Materials

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274

140

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Ultra‐broadband luminescent sources that emit light over an extremely wide wavelength range are of great interest in the fields of photonics, medical treatment, and precision measurement. Extensive research has been conducted on materials doped with rare‐earth and transition‐metal ions, but the goal of fabricating an ultra‐broadband emitter has not been attained. We present a facile method to realize this kind of novel light source by stabilizing “active” centers (bismuth) in a “tolerant” host (nanoporous silica glass). The obtained highly transparent materials, in which, unusually, multiple bismuth centers (Bi+, Bi2+, and Bi3+) can be stabilized, emit in an ultra‐broadband wavelength range from blue‐green, orange, red, and white to the near‐infrared region. This tunable luminescence covers the spectral range of the traditional three primary colors (RGB) and also the telecommunications windows.

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Section: Full Papermentioning

confidence: 99%

Multifunctional Bismuth‐Doped Nanoporous Silica Glass: From Blue‐Green, Orange, Red, and White Light Sources to Ultra‐Broadband Infrared Amplifiers

Zhou

Jiang

Zhu

et al. 2008

Adv Funct Materials

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274

140

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“…Therefore, rare-earth-doped oxide-based phosphors for FEDs have been of great interest due to their excellent light output, color rendering properties, and superior stability under electron bombardment. [21][22][23] One of the promising candidates in FEDs is the rare-earth-doped yttrium oxide ͑Y 2 O 3 ͒. Eu-doped Y 2 O 3 , discovered years ago, is still considered to be one of the best red oxide phosphors, mainly because of its excellent luminescent efficiency, color purity, and stability.…”

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confidence: 99%

Tunable Cathodoluminescence Properties of Tb[sup 3+]-Doped La[sub 2]O[sub 3] Nanocrystalline Phosphors

Liu

Zou

2010

J. Electrochem. Soc.

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Nanocrystalline Tb 3+ -doped La 2 O 3 phosphors were prepared through a Pechini-type sol-gel process. X-ray diffraction ͑XRD͒, field-emission-scanning electron microscopy ͑FESEM͒, photoluminescence, cathodoluminescence ͑CL͒ spectra, and lifetimes were utilized to characterize the synthesized phosphors. The XRD results revealed that a pure La 2 O 3 phase can be obtained at 700°C. FESEM images indicated that the La 2 O 3 :Tb 3+ phosphors are composed of aggregated spherical particles with sizes ranging from 60 to 100 nm. Under the excitation of UV light and low voltage electron beams ͑0. Although LCDs hold almost more than 50% of the market for flat panel displays, in demanding applications found in military applications, medical instruments, vehicles, and dusty environments, the weaknesses of LCDs are severe, viz., small viewing angle, limited operation temperature, relatively low brightness, and sensitivity for constant movement.2-4 Therefore, a considerable amount of research has been focused on the development of emissive flat panels. Among the emissive display technologies, field-emission displays ͑FEDs͒ have been developed as one of the most promising flat panel displays due to its potential to provide displays with thin panel thickness, self-emission, wide viewing, quick response, high brightness, high contrast ratio, light weight, and low power consumption. 5,6 Monocolor Spindt-type FEDs have been supplied to the market, and they have proven good reliability and performance since 7 years ago, 7 and preparation for mass production of color FEDs had started in recent years. Fundamentally, FEDs are constructed by three elemental parts, such as micro or nanofabrication of emitters, vacuum packaging, and phosphor anodes. Each of the three elements is essential to realize FEDs with interrelationship. 7,8 FEDs must operate at significantly lower excitation voltages ͑Յ5 kV͒ and higher current densities ͑10-100 A/cm 2 ͒ than CRTs. Thus phosphors for FEDs are required to have a high efficiency at low voltages, high resistance to current saturation, long service time, and equal or better chromaticity than CRT phosphors. 9The demand for high resolution and increased efficiency in phosphors for FEDs has promoted the development of phosphors that perform at low voltages.10-14 Many efficient sulfide-based phosphors, such as Y 2 O 2 S:Eu, Gd 2 O 2 S:Tb, SrGa 2 S 4 :Eu, Zn͑Cd͒S:Cu,Al, ZnS:Ag,Cl, etc., have been explored as possible low voltage phosphors.15-18 Unfortunately, sulfide phosphors are easy to decompose and to emit sulfide gases under the electron excitation, subsequently causing the cathodes to deteriorate, thus lowering the lifetime and luminous efficiency of phosphors. 19,20 Oxide-based phosphors are more stable and environmental friendly in comparison with sulfides. Therefore, rare-earth-doped oxide-based phosphors for FEDs have been of great interest due to their excellent light output, color rendering properties, and superior stability under electron bombardment. [21][22][23] One of the promising candidate...

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“…[1][2][3][4] Phosphors used in FEDs require several properties that the traditional cathode ray tube ͑CRT͒ phosphors may not possess, such as high electric conductivity, low surface recombination velocities, vacuum compatibility ͑low outgassing͒, hazardlessness to cathodes, and the ability to withstand high current densities. 5 The most popular sulfide-based phosphors for CRTs are no longer suitable for FEDs because of low conductivity and fast degradation at high current densities.…”

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confidence: 99%

Tunable Photoluminescence and Cathodoluminescence Properties of Eu[sup 3+]-Doped LaInO[sub 3] Nanocrystalline Phosphors

Liu

Lin

2009

J. Electrochem. Soc.

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LaInO 3 :Eu 3+ phosphors were prepared by a Pechini sol-gel process. X-ray diffraction ͑XRD͒, field-emission scanning electron microscopy ͑FE-SEM͒, diffuse reflectance, photoluminescence, cathodoluminescence spectra, as well as lifetimes were utilized to characterize the synthesized phosphors. XRD results reveal that the sample begins to crystallize at 600°C and pure LaInO 3 phase can be obtained at 800°C. The crystallinity increases upon raising the annealing temperature. The FE Field-emission display ͑FED͒ is a developing technology which has the potential to provide displays with a high brightness, high contrast ratio, light weight, and low power consumption.1-4 Phosphors used in FEDs require several properties that the traditional cathode ray tube ͑CRT͒ phosphors may not possess, such as high electric conductivity, low surface recombination velocities, vacuum compatibility ͑low outgassing͒, hazardlessness to cathodes, and the ability to withstand high current densities. 5 The most popular sulfide-based phosphors for CRTs are no longer suitable for FEDs because of low conductivity and fast degradation at high current densities.6-8 Semiconducting oxide-based phosphors have been found to be the optimal candidate, as they are sufficiently conductive to overcome the charge buildup on the phosphor surfaces, in addition to their thermal and chemical stability. 9-11Semiconducting compound LaInO 3 with a bandgap of 3.2 eV belongs to the orthorhombically distorted perovskite-like structure with space group Pnma.12 The structure consists of a threedimensional sublattice of corner-connected InO6 octahedra, and the La 3+ is in eightfold coordination of oxide ions, which have the potential to serve as a host material in phosphor applications. All the octahedra are sharing their corners and are slightly tilted. As opposed to a cubic perovskite, in LaInO 3 there are two crystallographic oxygen atoms, two ͑O1͒ on opposite corners of an octahedron along the b axis and four ͑O2͒ on the same a-c plane on an octahedron. 13 Aside from its luminescence potential, recent interest in LaInO 3 lanthanum orthoindate bulk crystals is driven by possible applications of this material as an electrolyte for solid fuel cells.14 Rare-earth ions have been playing an important role in modern lighting and display fields due to the abundant emission colors based on their 4f-4f or 5d-4f transitions. 1,7,10 The trivalent europium ion ͑Eu 3+ ͒ is well known as a red-emitting activator due to its 5 D 0 -7 F J ͑J = 0,1,2,3,4, usually ranging from 578 for J = 0 to 700 nm for were mixed together under stirring. Then, citric acid and polyethylene glycol ͑PEG, molecular weight = 10,000͒ were dissolved in the above solution ͑C PEG = 0.01 M, citric acid/metal ion = 2:1͒. The resultant mixtures were stirred for 1 h and condensed at 75°C in a water bath until homogeneous gels formed. After being dried in an oven at 110°C for 10 h, the gels were ground and prefired at 450°C for 4 h in air. Then, the samples were fully ground and fired to the desired temperatur...

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Blue cathodoluminescence from Ba2B5O9Cl:Eu phosphor thin films on glass substrates

Abstract: Articles you may be interested inPhotoluminescence and electroluminescence from Eu-activated Ca Al 2 O 4 -based multicomponent oxide thinfilm phosphors

Cited by 48 publications

References 18 publications

Multifunctional Bismuth‐Doped Nanoporous Silica Glass: From Blue‐Green, Orange, Red, and White Light Sources to Ultra‐Broadband Infrared Amplifiers

Multifunctional Bismuth‐Doped Nanoporous Silica Glass: From Blue‐Green, Orange, Red, and White Light Sources to Ultra‐Broadband Infrared Amplifiers

Tunable Cathodoluminescence Properties of Tb[sup 3+]-Doped La[sub 2]O[sub 3] Nanocrystalline Phosphors

Tunable Photoluminescence and Cathodoluminescence Properties of Eu[sup 3+]-Doped LaInO[sub 3] Nanocrystalline Phosphors

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