Aspects of Pr3+ luminescence in solids

Srivastava, A.M.

doi:10.1016/j.jlumin.2015.07.001

Cited by 96 publications

(51 citation statements)

References 30 publications

(38 reference statements)

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“…To obtain fast and high-energy-shifted 5d-4f emission of Pr 3+ the crystal field of the host matrix should be strong enough to shift the lowest 5d-state well below the 1 S 0 one to make the 5d-4f radiative transition possible. For details on these aspects of the Pr 3+ luminescence, see for example [16]. High quality Pr-doped Lu 3 Al 5 O 12 (LuAG:Pr) was announced as a fast and efficient scintillator [17,18] and an attempt of its application in positron emission mammography has been already made [19].…”

Section: Introductionmentioning

confidence: 99%

Luminescence and scintillation properties of Mg-codoped LuAG:Pr single crystals annealed in air

Pejchal

Buryi

Babin

et al. 2017

Journal of Luminescence

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The influence of the Mg 2+ codoping and annealing in the air on the scintillation and luminescence characteristics of Pr-doped lutetium-aluminum garnet crystals (LuAG) was studied to find a possible positive effect of Pr 4+. The overall scintillation efficiency under X-ray excitation of the annealed Pr-doped samples decreased with increasing Mg concentration. This was explained by increased overlap of the Pr 3+ 5d-4f emission with the charge-transfer (CT) absorption band of the Pr 4+ ion stabilized by Mg 2+. This absorption caused even greater decrease of the light yield, as the light is collected from the whole sample volume in the pulse-height spectrum measurement. Electron centers based on oxygen vacancies (F + centers) which can have negative influence on scintillation mechanism were revealed by the electron paramagnetic resonance (EPR) experiments. The Ohole center was detected as well and the temperature dependences of the EPR spectra showed that its thermal stability was decreased by Mg codoping. Negligible changes in the decay time of Pr 3+ 5d-4f photoluminescence exclude the non-radiative energy transfer from relaxed 5d 1 excited state of Pr 3+ towards CT absorption transition of Pr 4+ and suggest that simple reabsorption of the emitted light takes place. Unlike for the Ce-doped analogues, promoting the Pr 3+ luminescence center to the tetravalent state by divalent ion co-doping and air annealing did not improve scintillation properties of Pr-doped LuAG.

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Section: Introductionmentioning

confidence: 99%

Luminescence and scintillation properties of Mg-codoped LuAG:Pr single crystals annealed in air

Pejchal

Buryi

Babin

et al. 2017

Journal of Luminescence

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“…1a). To ensure the occurrence of Pr 3+ 4f 1 5d 1 → 4f 2 transitions in the UVC in a solid, two general conditions are required: a small Stokes shift of less than about 3000 cm −1 (0.37 eV) and an appropriate energy location of the first (lowest energy) Pr 3+ 4f 2 → 4f 1 5d 1 excitation transition [14][15][16][17][18] , which are associated with the compositions and crystal structures of the host lattices. Under these conditions, the nonradiative relaxation of the Pr 3+ 4f 1 5d 1 level to the lower 4f 2 ( 3 P J , 1 I 6 , 1 D 2 ) levels is minimized; otherwise, crossing of the 4f 1 5d 1 level with the lower 4f 2 levels will occur and, as a result, sharp line 4f 2 → 4f 2 intraconfigurational emission transitions for visible and/or infrared-light emission will dominate (Fig.…”

mentioning

confidence: 99%

Solar-blind ultraviolet-C persistent luminescence phosphors

et al. 2020

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Visible-light and infrared-light persistent phosphors are extensively studied and are being used as self-sustained glowing tags in darkness. In contrast, persistent phosphors for higherenergy, solar-blind ultraviolet-C wavelengths (200-280 nm) are lacking. Also, persistent tags working in bright environments are not available. Here we report five types of Pr 3+-doped silicates (melilite, cyclosilicate, silicate garnet, oxyorthosilicate, and orthosilicate) ultraviolet-C persistent phosphors that can act as self-sustained glowing tags in bright environments. These ultraviolet-C persistent phosphors can be effectively charged by a standard 254 nm lamp and emit intense, long-lasting afterglow at 265-270 nm, which can be clearly monitored and imaged by a corona camera in daylight and room light. Besides thermal-stimulation, in bright environments, photo-stimulation also contributes to the afterglow emission and its contribution can be dominant when ambient light is strong. This study expands persistent luminescence research to the ultraviolet-C wavelengths and brings persistent luminescence applications to light.

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“…Таким образом, спектры ФЛ при ВУФ-возбуждении, спектры РЛ и ИКЛ содержат три группы полос и линий, спектральное положение которых совпадает, но их относительная интенсивность различна. УФ-полосы в области 270−300 nm имеют ns-кинетику затухания РЛ и ИКЛ, характерную для межконфигурационных 5d → 4 f -переходов в ионах Pr 3+ [1][2][3][4]. Поэтому они связаны с внутриконфигурационными переходами с нижайшего возбужденного 4 f 1 5d 1 -состояния на 3 H J и 3 F J мультиплеты основной 4 f 2 -электронной конфигурации (4 f 1 5d 1 → 4 f 2 ) ионов Pr 3+ .…”

Section: обсуждение экспериментальных данныхunclassified

“…Хорошо известно, что широкощелевые соединения, в частности, комплексные силикаты, фосфаты, бинарные галогениды РЗЭ, легированные ионами Ce 3+ или Pr 3+ , находят применение в качестве быстрых сцинтилляционных детекторов благодаря высокому световыходу и быстрой наносекундной кинетике затухания люминесценции [1][2][3][4][5]. В комплексных фосфатах Sr 9 Sc(PO 4 ) 7 d− f -люминесценцию примесных ионов Ce 3+ или Eu 2+ предложено использовать для повышения эффективности транспорта энергии между примесными центрами с целью получения эффективных " белых" светоизлучающих диодов [6].…”

Section: Introductionunclassified

Люминесценция примесных Pr-=SUP=-3+-=/SUP=--центров и дефектов в Sr-=SUB=-9-=/SUB=-Sc(PO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=-:Pr-=SUP=-3+-=/SUP=-

Пустоваров¹,

Ivanovskikh²,

Хатченко³

et al. 2019

Физика Твердого Тела

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The spectroscopic characteristics and luminescence decay kinetics of Sr_9Sc(PO_4)_7:Pr^3+(1%) were investigated using synchrotron radiation of ultraviolet (UV), vacuum ultraviolet (VUV) and X-ray ranges, as well as pulsed cathodoluminescence (PCL) methods at temperatures of 10, 90, and 295 K. The luminescence spectra contain three groups of bands and lines. In the UV range, the observed bands correspond to interconfigurational 5 d → 4 f transitions in Pr^3+ ions. In the visible spectrum, the wide luminescence band of defects dominates, as well as narrow lines associated with intraconfigurational 4 f → 4 f transitions in Pr^3+ ions. When excited by an electron beam (5 Hz), the main component with a decay time τ ∼ 17 ns dominates in the decay kinetics of the 5 d → 4 f luminescence. The decay kinetics of 5 d → 4 f luminescence upon excitation with high-frequency (τ ∼ 8 MHz) synchrotron radiation of the X-ray range contains a fast component (τ ∼ 15 ns) against the background of the slow component of the μs-range. An effective nonradiative energy transfer is observed from impurity centers to defects, as well as from the host to Pr^3+ ions and defects.

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Aspects of Pr3+ luminescence in solids

Cited by 96 publications

References 30 publications

Luminescence and scintillation properties of Mg-codoped LuAG:Pr single crystals annealed in air

Luminescence and scintillation properties of Mg-codoped LuAG:Pr single crystals annealed in air

Solar-blind ultraviolet-C persistent luminescence phosphors

Люминесценция примесных Pr-=SUP=-3+-=/SUP=--центров и дефектов в Sr-=SUB=-9-=/SUB=-Sc(PO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=-:Pr-=SUP=-3+-=/SUP=-

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