Composition–property relationships in (Gd3−xLux)(GayAl5−y)O12:Ce (x=0, 1, 2, 3 and y=0, 1, 2, 3, 4) multicomponent garnet scintillators

Luo, Jialiang; Wu, Yuntao; Zhang, Guoqing; Zhang, Huaijin; Ren, Guina

doi:10.1016/j.optmat.2013.10.012

Cited by 34 publications

(19 citation statements)

References 30 publications

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“…In 1967, Blasse and Bril firstly reported YAG: Ce as a new phosphor for flying-spot cathode ray tubes10. Due to high light yield (20000 photons/ MeV) and fast response time, in the 1990s YAG: Ce and the higher density analogue Lu 3 Al 5 O 12 : Ce (LuAG) and (Lu,Gd) 3 (Al,Ga) 5 O 12 were proposed as scintillators for X-ray and gamma-ray radiation detection, used in X-ray computed tomographic scanner (CTS) and positron emission tomography (PET) for medical imaging and in scanning electron microscopy (SEM)1011121314.…”

mentioning

confidence: 99%

Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs

Chen

Liu

et al. 2015

Sci Rep

107

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The deficiency of Y3Al5O12:Ce (YAG:Ce) luminescence in red component can be compensated by doping Gd3+, thus lead to it being widely used for packaging warm white light-emitting diode devices. This article presents a systematic study on the photoluminescence properties, crystal structures and electronic band structures of (Y1−xGdx)3Al5O12: Ce3+ using powerful experimental techniques of thermally stimulated luminescence, X-ray diffraction, X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and ultraviolet photoelectron spectra (UPS) of the valence band, assisted with theoretical calculations on the band structure, density of states (DOS), and charge deformation density (CDD). A new interpretation from the viewpoint of compression deformation of electron cloud in a rigid structure by combining orbital hybridization with solid-state energy band theory together is put forward to illustrate the intrinsic mechanisms that cause the emission spectral shift, thermal quenching, and luminescence intensity decrease of YAG: Ce upon substitution of Y3+ by Gd3+, which are out of the explanation of the classic configuration coordinate model. The results indicate that in a rigid structure, the charge deformation provides an efficient way to tune chromaticity, but the band gaps and crystal defects must be controlled by comprehensively accounting for luminescence thermal stability and efficiency.

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mentioning

confidence: 99%

Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs

Chen

Liu

et al. 2015

Sci Rep

107

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“…17 Unfortunately, with increasing Ga 3+ content, thermally induced ionization of an electron from 5d 1 state to the conduction band becomes feasible around room temperature due to the reduction of ionization energy barrier, 18 which deteriorates the scintillation efficiency. [19][20][21][22] Further optimization was achieved by "energy level positioning" strategy through the Gd 3+ admixture. 19,23 Specifically, upon the Gd 3+ admixture the 5d 1 level moves downward and can compensate the upward shift and resulting negative effect due to Ga 3+ admixture.…”

mentioning

confidence: 99%

Origin of improved scintillation efficiency in (Lu,Gd)3(Ga,Al)5O12:Ce multicomponent garnets: An X-ray absorption near edge spectroscopy study

Luo

Nikl

et al. 2014

APL Materials

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In the recent successful improvement of scintillation efficiency in Lu3Al5O12:Ce driven by Ga3+ and Gd3+ admixture, the “band-gap engineering” and energy level positioning have been considered the valid strategies so far. This study revealed that this improvement was also associated with the cerium valence instability along with the changes of chemical composition. By utilizing X-ray absorption near edge spectroscopy technique, tuning the Ce3+/Ce4+ ratio by Ga3+ admixture was evidenced, while it was kept nearly stable with the Gd3+ admixture. Ce valence instability and Ce3+/Ce4+ ratio in multicomponent garnets can be driven by the energy separation between 4f ground state of Ce3+ and Fermi level.

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“…Katayama et al [100] reproduced this result in the same material, but it was co-doped with Bi 3+ . Luo et al [101] studied multicomponent garnet scintillators (Lu x Gd 3− x )(Ga y Al 5− y )O 12 :Ce ( x = 0, 1, 2, 3 and y = 0, 1, 2, 3, 4) and identified changes in the band gap by monitoring the shift of the corresponding TL glow peaks. All these studies show that TSL is an indispensable experimental tool in understanding the electron transfer mechanism.…”

Section: Thermoluminescence As a Research Toolmentioning

confidence: 99%

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

Bos

2017

Materials

223

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Thermally stimulated luminescence (TSL) is known as a technique used in radiation dosimetry and dating. However, since the luminescence is very sensitive to the defects in a solid, it can also be used in material research. In this review, it is shown how TSL can be used as a research tool to investigate luminescent characteristics and underlying luminescent mechanisms. First, some basic characteristics and a theoretical background of the phenomenon are given. Next, methods and difficulties in extracting trapping parameters are addressed. Then, the instrumentation needed to measure the luminescence, both as a function of temperature and wavelength, is described. Finally, a series of very diverse examples is given to illustrate how TSL has been used in the determination of energy levels of defects, in the research of persistent luminescence phosphors, and in phenomena like band gap engineering, tunnelling, photosynthesis, and thermal quenching. It is concluded that in the field of luminescence spectroscopy, thermally stimulated luminescence has proven to be an experimental technique with unique properties to study defects in solids.

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Composition–property relationships in (Gd3−xLux)(GayAl5−y)O12:Ce (x=0, 1, 2, 3 and y=0, 1, 2, 3, 4) multicomponent garnet scintillators

Cited by 34 publications

References 30 publications

Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs

Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs

Origin of improved scintillation efficiency in (Lu,Gd)3(Ga,Al)5O12:Ce multicomponent garnets: An X-ray absorption near edge spectroscopy study

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

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