Cathodoluminescent and thermal properties of carbon nanotube–ZnS:Cu, Al phosphor composites

Park, J. H.; Park, B. W.; Park, K. W.; Kim, J. S.; Kim, G. C.; Yoo, Joong Hak; Yu, Il

doi:10.1016/j.ssc.2008.09.036

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…In recent years, studies on lanthanide ion (Ln 3+ )-doped materials have attracted increasing attention in light-emitting diodes (LEDs), field emission displays (FEDs), and plasma display panels (PDPs). − The tunable emission color of phosphor for LED is a key point. In order to realize the tunable luminescence, many materials, which are based on energy transfer between the codoped multiactivators under UV excitation, have been successfully developed. − As far as FED phosphors, most of the reported sulfide-based phosphors would contaminate the field emitter and hinder the electron emission, because the sulfide is easy to degrade and disperse into the vacuum, under electron beam bombardment. − Compared with the sulfide phosphors, the oxide phosphors, which could escape these obstacles, have attracted a great deal of attention. − Therefore, looking for materials with good stability and conductivity for FED phosphors has attracted much interest.…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Vacancies on the Reduction of Eu³⁺in Mg₃Ca₃(PO₄)₄in Air Atmosphere

Wang

2017

Inorg. Chem.

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The paper reported the synthesis of mixed-valence Eu-doped MgCa(PO) by solid-state reaction in the air atmosphere. The luminescence measurements indicated that the obtained phosphors exhibit a broad bluish-green fluorescence of Eu and a sharp orange-red emission of Eu excited by 395 nm. The abnormal reduction mechanism could be explained by a charge compensation model. A tunable luminescence was realized based on the reduction of Eu to Eu changed along with increasing the sintering time. The reduction of Eu to Eu in MgCa(PO) host was effected by the oxygen vacancy defects when the samples sintered in different atmosphere and sintered for different lengths of time, and the oxygen vacancies which act as the electron traps were investigated with thermoluminescence. All of the results almost indicated the oxygen vacancy could weaken the reduction of Eu to Eu. Our investigation of MgCa(PO):Eu could provide a practical basis and theoretical basis to study the effect of oxygen vacancy on the emission of Eu ions.

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Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Vacancies on the Reduction of Eu³⁺in Mg₃Ca₃(PO₄)₄in Air Atmosphere

Wang

2017

Inorg. Chem.

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“…The green phosphor of ZnS:Cu,Al was chosen in this study because ZnS-based materials have been the most widely used in FEDs due to their high luminous efficiency [6,14]. For the phosphor, we blended ZnS:Cu,Al particles with binder-polymer, and screen-printed it onto an ITO/glass substrate.…”

Section: Methodsmentioning

confidence: 99%

Preserving long-term emission stability of carbon nanotube field emitter using aluminum layer

Lim

Choi

2010

Current Applied Physics

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“…For a number of years Al 3+ has been added as a co-dopant to green emitting ZnS:Cu phosphors that have been used in cathode ray tube (CRT) devices. [10][11][12] In addition, ZnS:Cu,Al has been investigated for use in low voltage field emission devices, 13 as nanocrystals 14 and as quantum dots (QDs). 15 From these studies on co-doping with Al 3+ that reported the visible photoluminescence properties of ZnS:Cu,Al it was apparent that the dopant confers useful attributes when it is added.…”

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confidence: 99%

ZnCdS:Cu,Al,Cl: A Near Infra-Red Emissive Family of Phosphors for Marking, Coding, and Identification

Silver

Marsh

Fern

et al. 2017

ECS J. Solid State Sci. Technol.

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Zn 1-x Cd x :Cu 0.03% ,Cl (where x = 0.5-0.9) infrared emitting phosphors have been synthesized by an aqueous thermal decomposition method. The aim was to developing infrared emitting phosphors for coding, marking, and identification applications. The phosphors were characterized by, X-ray powder diffraction, scanning electron microscopy and photoluminescence spectroscopy. The emission band at 1000 nm was sufficiently far into the infrared region that visible emission was minimized. Co-doping Zn 1-x Cd x S:Cu 0.03% with Al 3+ increased the infrared emission intensity to over twice that of the equivalent Zn 0.3 Cd 0.7 S:Cu 0.03% phosphor (with no Al 3+ ion co-doping), with the highest intensity being found for the phosphor composition Zn 0.1 Cd 0.9 S:Cu 0.03%, Al 0.03% . It is shown herein that the inclusion of Al 3+ into the phosphors causes the formation of cells with smaller cell volume, and it is suggested that this is the prerequisite for the improved photoluminescent properties. Finally we have shown herein that these infrared emitting powder phosphors are thus able to meet marking and coding requirements, especially in low light and poor visibility. Although the uses of phosphors are widespread in modern technologies and they are common in the display and lighting industries where products find applications in both domestic and commercial applications, their use in other areas is less widely appreciated. Such uses include:-on postage stamps to help letter sorting, on currency and bank notes for secrecy/authenticity, thermometry, luminescent paints and glow in the dark toys. In addition there are a number of military applications.Recently the wide availability of near-ultraviolet light and visible light emitting diodes (LEDs) and laser diodes in addition to infrared emitting systems has made the remote excitation of infrared emitting phosphors a practical possibility. Infrared emitting powder phosphors have the potential to meet marking and coding requirements, especially in low light and poor visibility.The advantages of IR emitting powder phosphors are:-1) That they can be easily deposited by conventional techniques to form large areas, if required, either by simple settling techniques, or by inclusion in a binder suitable for screen or ink-jet printing (the binder of course must be transparent over the required spectral range). 2) Such deposited powder layers, depending on their thickness and particle size and particle morphology etc., can be used in a transmission or a reflective mode with suitable UV or visible excitation sources.The ease of fabrication and the wide excitation spectra of the phosphors as well as their efficiencies facilitate a wide range of potential applications, including the following as preliminary examples: a) For use in coding/marking systems as simple IR sensitive markers. b) For improved marking/detection in conjunction with night vision systems.The origins of the green luminescence in ZnS:Cu phosphors (where Cu is introduced as a dopant into the ZnS lattice) has been attribute...

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Cathodoluminescent and thermal properties of carbon nanotube–ZnS:Cu, Al phosphor composites

Cited by 8 publications

References 6 publications

Effect of Oxygen Vacancies on the Reduction of Eu³⁺in Mg₃Ca₃(PO₄)₄in Air Atmosphere

Effect of Oxygen Vacancies on the Reduction of Eu³⁺in Mg₃Ca₃(PO₄)₄in Air Atmosphere

Preserving long-term emission stability of carbon nanotube field emitter using aluminum layer

ZnCdS:Cu,Al,Cl: A Near Infra-Red Emissive Family of Phosphors for Marking, Coding, and Identification

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Cathodoluminescent and thermal properties of carbon nanotube–ZnS:Cu, Al phosphor composites

Cited by 8 publications

References 6 publications

Effect of Oxygen Vacancies on the Reduction of Eu3+in Mg3Ca3(PO4)4in Air Atmosphere

Effect of Oxygen Vacancies on the Reduction of Eu3+in Mg3Ca3(PO4)4in Air Atmosphere

Preserving long-term emission stability of carbon nanotube field emitter using aluminum layer

ZnCdS:Cu,Al,Cl: A Near Infra-Red Emissive Family of Phosphors for Marking, Coding, and Identification

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Effect of Oxygen Vacancies on the Reduction of Eu³⁺in Mg₃Ca₃(PO₄)₄in Air Atmosphere

Effect of Oxygen Vacancies on the Reduction of Eu³⁺in Mg₃Ca₃(PO₄)₄in Air Atmosphere