Photostimulated luminescence in a rare earth-doped fluorobromozirconate glass ceramic

Edgar, A.; Spaeth, J.‐M.; Schweizer, Stefan; Assmann, S.; Newman, Peter J.; MacFarlane, Douglas R.

doi:10.1063/1.125022

Cited by 45 publications

(34 citation statements)

References 9 publications

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“…Model of an H-type F À 2 centre in BaFBr with two equivalent fluorine nuclei after [61] much shorter (3.18 A) than the Br ---Br --distance, either in plane (4.50 A) or out of plane (3.72 A). Also there are linear [110] or [100] chains of equivalent F --ions, whereas the hole motion within the Br --double layer would need to proceed in a zigzag motion to separate from the F centre. The former pathway resembles more the situation in the alkali halides, where the hole motion is known to proceed along the [110] halogen chain.…”

Section: Generation Of Electron and Hole Trap Centresmentioning

confidence: 99%

“…Also there are linear [110] or [100] chains of equivalent F --ions, whereas the hole motion within the Br --double layer would need to proceed in a zigzag motion to separate from the F centre. The former pathway resembles more the situation in the alkali halides, where the hole motion is known to proceed along the [110] halogen chain.…”

Section: Generation Of Electron and Hole Trap Centresmentioning

confidence: 99%

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Physics and Current Understanding of X-Ray Storage Phosphors

Schweizer

2001

phys. stat. sol. (a)

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163

108

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BaFBr doped with Eu 2+ is the most successful X-ray storage phosphor used for digital radiography so far. The mechanisms of information storage and subsequent read-out are, however, not yet fully understood. The present understanding of the structures and reactions of the radiation-induced point defects involved in these processes are critically discussed. The shortcomings of X-ray storage phosphor screens based on BaFBr : Eu 2+ are the inferior spatial resolution compared to conventional X-ray films. Also reviewed are therefore alternative storage phosphors such as alkali halides doped with Eu 2+ , Ga + , In + , or Tl + or elpasolites doped with Ce 3+ or Eu 2+ which are also promising with high figures of merit and potentially higher spatial resolution. A completely new approach is the use of suitably doped glasses and glass ceramics. First results on fluorozirconate glass ceramics with good storage and read-out properties are reviewed.

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Section: Generation Of Electron and Hole Trap Centresmentioning

confidence: 99%

Section: Generation Of Electron and Hole Trap Centresmentioning

confidence: 99%

Physics and Current Understanding of X-Ray Storage Phosphors

Schweizer

2001

phys. stat. sol. (a)

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163

108

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“…Fluoride nano-crystals have been obtained recently in fluorozirconate glasses, a novel application of fluorozirconate glass-ceramic has been proposed as an x-ray storage phosphor [1,2]. Less investigated are fluoride crystallites in oxyfluorides: aluminate [3][4][5] and SiO 2 glasses [6]; new interesting properties of the so-called up-conversion have been reported in [4][5][6].…”

Section: Introductionmentioning

confidence: 98%

Luminescence of Ce‐doped borate‐oxyfluoride glass ceramics

Dimitrocenko

Rogulis

Veispals

et al. 2007

Phys. Status Solidi (c)

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PACS 78.40. Pg, 78.55.Qr In the present work we studied the possibility to obtain oxyfluoride glass ceramics based on a lithium and potassium borate glasses with addition of fluorides. Lithium-borate glasses without lanthanum fluoride are transparent up to 275 nm. In samples with LaF 3 doped with Ce-activator, an additional absorption at about 300 nm and intense photoluminescence could be observed. Ce-doped potassium-borate glass with addition of fluorides LaF 3 , LiF and GdF 3 was milky and not transparent, an intense photoluminescence has been observed, X-ray diffraction measurements showed a presence of well-pronounced crystalline phases of LiF as well as of GdBO 3 .

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“…As in the previous studies, researchers have focused on controlling color and efficiency by manipulating the active ions in the glass. Edgar et al 46 reported a fluorobromozirconate glass doped with Eu 2+ /Ce 3+ . Lakshminarayana et al 47 reported Tm 3+ /Dy 3+ co-doped oxyfluoride germinate glasses for white light emission.…”

Section: Glass Phosphor Plate (Gpp)mentioning

confidence: 99%

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Kim

Viswanath

Unithrattil

et al. 2017

ECS J. Solid State Sci. Technol.

127

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In the past decades, solid-state lighting based on phosphors as energy converters has been a fast-growing industry. Phosphorconverted white light-emitting diodes (pc-wLEDs) enable high-power applications and miniaturization; for this, the phosphor must have good stability and high efficiency. In order to satisfy this demand, phosphor plates have been proposed instead of conventional organic-based phosphor binders. In this review, such phosphor plates are categorized according to their synthesis methods, and the advantages and disadvantages of each category are detailed. In addition, we describe the major aspects of phosphor plates that require improvement for applications in high-power devices. For the fabrication of high-power LEDs, the phosphor configuration, color purity, porosity, and particle size of glass powders are key properties to enhance the luminescence efficiency and reduce the generation of heat inside wLED packages, thereby improving thermal stability. The advent of authentic, energy-efficient lighting in the home and workplace significantly affected the modern way of life. Beginning with the mass production of incandescent light bulbs, and with the subsequent evolution of fluorescence lights, lighting technology has developed rapidly in the last few decades. Since Edison's incandescent bulb in 1879, 1 artificial lighting has been developed to increase power output and decrease the size of the system. The development of red light-emitting diodes (LEDs) in 1962 2 and blue LEDs in 1993 3 allowed innovation in lighting and display. In particular, combinations of blue LEDs and yellow phosphors are used for many applications because they can realize cheap and efficient white solid-state lighting with several advantages including long lifetimes, eco-friendly behavior, and the capacity of miniaturization. 4-6In phosphor-converted white LEDs (pc-wLEDs), the phosphor converter dispersed in silicon resin (phosphor-in-silicon; PiS) is directly packed on a blue InGaN chip.7 When driven by a bias current, the emitted blue light absorbed by the phosphor is emitted as yellow light; together with the transmitted blue light, this constitutes white luminescence. However, this method lacks a red component, which entails the drawbacks of a poor color rendering index (CRI) and limited correlated color temperature (CCT). To overcome these drawbacks, one proposed method mixes yellow phosphors with phosphors having green to red emissions under blue excitation. 8 In pc-wLEDs, the color is primarily determined by the ratio of the blue emission from the LED chip to the yellow to red emission from the phosphor. However, the efficacy and brightness are determined by the converted yellow to red emission, as it contributes the bulk of lumens. In this configuration, the heat generated from the LED chip and phosphor cannot be efficiently dissipated because of the poor thermal stability and weak thermal conductivity of the resin, which causes luminous decay and color shifting in white light-emitting diodes (wLEDs).9 When the tempe...

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Photostimulated luminescence in a rare earth-doped fluorobromozirconate glass ceramic

Cited by 45 publications

References 9 publications

Physics and Current Understanding of X-Ray Storage Phosphors

Physics and Current Understanding of X-Ray Storage Phosphors

Luminescence of Ce‐doped borate‐oxyfluoride glass ceramics

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

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