Concentration Quenching of Photoluminescence

Baldacchini, G.; Menchini, Francesca; Montereali, Rosa Maria

doi:10.1149/1.1566964

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…11, at the highest dose the primary F centers reach an average density of 5 × 10 19 centers cm −3 and the F 2 one is estimated ∼10 18 centers cm −3 , with respect to 6.1 × 10 22 halogen sites cm −3 in LiF. At this high CCs densities, also quenching phenomena will differently affect the PL of F 2 and F 3 + defects, 79 especially for the F 3 + ones. 80 According to Fig.…”

Section: Lif Imaging Detectors Based On Rpl For Advanced Proton Beam ...mentioning

confidence: 90%

Radiophotoluminescence of Color Centers in Lithium Fluoride for Novel Radiation Detectors in Proton-Beam Diagnostics and Clinical Dosimetry

Montereali

Nichelatti

Piccinini

et al. 2021

ECS J. Solid State Sci. Technol.

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The peculiar photoluminescence properties of radiation-induced electronic defects in lithium fluoride (LiF), known as color centers, are well known for applications in tunable lasers and photonic light-emitting microdevices operating at room temperature. In the last two decades they have been under exploitation in radiation imaging detectors and dosimeters based on the optical reading of the visible photoluminescence in LiF crystals and polycrystalline thin films. They were proposed for soft X-ray imaging at high spatial resolution and, more recently, their use has been successfully applied to advanced diagnostics of proton beams. After proton irradiation of LiF, the emission intensity of the radiation-induced point defects is proportional to the absorbed dose over several orders of magnitude, thus novel solid-state dosimeters with imaging capabilities can be envisaged, although dose values that are typical of clinical radiotherapy are still a challenge. In this brief review, the main experimental results and recent advances concerning radiophotoluminescence of color centers in optically transparent LiF crystals and polycrystalline thin films are presented and discussed in order to highlight the advantages, challenges and limits related to the feasibility of detectors for protontherapy applications.

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Section: Lif Imaging Detectors Based On Rpl For Advanced Proton Beam ...mentioning

confidence: 90%

Radiophotoluminescence of Color Centers in Lithium Fluoride for Novel Radiation Detectors in Proton-Beam Diagnostics and Clinical Dosimetry

Montereali

Nichelatti

Piccinini

et al. 2021

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…These results suggested that the contribution of DCJTB to EL spectrum of device is bigger in the doped device than in the undoped device. Considering that DCJTB concentration is higher in the undoped device, the smaller contribution of DCJTB obviously originates from concentration quench effect (CQE) of DCJTB, which is a common sense in dye-doped device as widely reported in literatures [9,10]: as concentration of the fluorescent dye increases, excitons concentration of the dye also increases. As a result a stronger interaction between excitons will appear, leading to more excitons deactivate nonradiatively or, in other words, more serious exciton-exciton quenching.…”

Section: Methodsmentioning

confidence: 96%