Photoluminescence, photoacoustic, and scintillation properties of Te 4+ -doped Cs 2 HfCl 6 crystals

Fujimoto, Yutaka; Saeki, Keiichiro; Nakauchi, Daisuke; Fukada, Haruki; Yanagida, Takayuki; Kawamoto, Hiroki; Koshimizu, Masanori; Asai, Keisuke

doi:10.1016/j.materresbull.2018.04.050

Cited by 30 publications

(13 citation statements)

References 29 publications

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“…It is necessary to mention research reported in [21], where the question of doping of CHC crystal by Te 4+ ions was addressed. In this study the photoluminescence (PL) and scintillation properties of 1.0, 3.0, 5.0, and 10 mol% Te 4+ -doped Cs 2 HfCl 6 crystals were investigated along with photoacoustic (PA) spectroscopy, which enables direct monitoring of the non-radiative de-excitation processes that take place in the sample after absorption of irradiation energy.…”

Section: Crystal Typementioning

confidence: 99%

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

Nagorny

2021

Physics

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Recent progress in Cs2HfCl6 (CHC) crystal production achieved within the last five years is presented. Various aspects have been analyzed, including the chemical purity of raw materials, purification methods, optimization of the growth and thermal conditions, crystal characterization, defect structure, and internal radioactive background. Large volume, crack-free, and high quality CHC crystals with an ultimate scintillating performance were produced as a result of such extensive research and development (R & D) program. For example, the CHC crystal sample with dimensions ∅23 × 30 mm3 demonstrates energy resolution of 3.2% FWHM at 662 keV, the relative light output at the level of 30,000 ph/MeV and excellent linearity down to 20 keV. Additionally, this material exhibits excellent pulse shape discrimination ability and low internal background of less than 1 Bq/kg. Furthermore, attempts to produce a high quality CHC crystal resulted in research on this material optimization by constitution of either alkali ions (Cs to Tl), or main element (Hf to Zr), or halogen ions (Cl to Br, I, or their mixture in different ratio), as well as doping with various active ions (Te4+, Ce3+, Eu3+, etc.). This leads to a range of new established scintillating materials, such as Tl2HfCl6, Tl2ZrCl6, Cs2HfCl4Br2, Cs2HfCl3Br3, Cs2ZrCl6, and Cs2HfI6. To exploit the whole potential of these compounds, detailed studies of the material’s fundamental properties, and understanding of the variety of the luminescence mechanisms are required. This will help to understand the origin of the high light yield and possible paths to further extend it. Perspectives of CHC crystals and related materials as detectors for rare nuclear processes are also discussed.

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Section: Crystal Typementioning

confidence: 99%

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

Nagorny

2021

Physics

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“…Therefore, the research strategy has been transferred to the substitution of aliovalent metal ions for Pb 2+ . It is worth noting that two B can be replaced by B I and B III , for example, Cs 2 NaBiCl 6 , Cs 2 (Ag 0.6 Na 0.4 )InCl 6 , Cs 2 NaBi 1– x In x Cl 6 , Cs 2 Na 1– x Ag x BiCl 6 , etc. − The second way is to explore perovskites with new chemical formulas AB III X 4 A 3 B III 2 X 9 and A 2 B′X 4 (B′ = Fe 2+ , Cu 2+ , Zn 2+ , and Mn 2+ ). − The third way is to replace the B-site Pb 2+ in ABX 3 with B IV (B IV = Sn 4+ , Hf 4+ , Zr 4+ , Pd 4+ , Ti 4+ , and Te 4+ ). − Based on this strategy, vacancy-ordered double perovskites A 2 B IV X 6 with good chemical stability have been formed, such as Cs 2 SnCl 6 , Cs 2 HfCl 6 , and Cs 2 ZrCl 6 . − Among them, Cs 2 ZrCl 6 has been early explored about its luminescence. However, the emission of Cs 2 ZrCl 6 requires high-energy wavelength excitation, and it has not attracted widespread attention in the field of optoelectronics in the early years.…”

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confidence: 99%

Efficient Energy Transfer in Te⁴⁺-Doped Cs₂ZrCl₆ Vacancy-Ordered Perovskites and Ultrahigh Moisture Stability via A-Site Rb-Alloying Strategy

Chang

Wei

Zeng

et al. 2021

J. Phys. Chem. Lett.

148

151

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As an effective method to improve the optical properties and stability of perovskite matrix, doped halide perovskites have attracted extensive attention in the field of optoelectronic applications. Herein, a series of all inorganic lead-free Te4+-doped Cs2ZrCl6 vacancy-ordered perovskites were successfully synthesized with different Te-doping concentrations by a solvothermal method, and deliberate Te4+-doping results in green-yellow triplet self-trapped exciton (STE) emission with a high photoluminescence quantum yield (PLQY) of 49.0%. The efficient energy transfer was observed from singlet to triplet emission. Further, the effects of A-site Rb alloying on the optical properties and stability were investigated. We found that A-site Rb alloying and C-site cohalogenation did not change the luminescence properties of Te4+, but the addition of a small amount of Rb+ can improve the PL intensity and moisture stability. Our results provide physical insights into the nS2 Te4+-ion-doping-induced emissive mechanism and shed light on improving the environmental stability for further applications.

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“…Similar results were observed in Cs 2 HfCl 6 :Te 4+ crystalline scintillators in an earlier study. (30) To date, there are no theories to predict the performance of scintillators, and one phenomenological model (Robbins' model) is commonly used to explain the scintillation efficiency. (31,32) The model is formulated as LY SC = E/(βE g ) × S × Q, where LY SC is the scintillation LY, E is the deposited energy of ionizing radiation, β is the constant parameter, E g is the band gap energy, S is the energy migration efficiency from the host to emission centers, and Q is the fluorescence QE of the emission centers.…”

Section: Resultsmentioning

confidence: 99%

Development and Performance Test of Deep Ultraviolet–Visible Photoacoustic Spectroscopy System for Nonradiative Deactivation Characterization in Phosphor Materials

Fujimoto

Nakauchi

Yanagida

et al. 2020

Sensors and Materials

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We developed a deep-ultraviolet-visible photoacoustic (PA) spectroscopy system for the evaluation of nonradiative deactivation in phosphor materials. The system consists of a xenon arc lamp of 300 W with an aspherical condensing mirror, a monochromator, a mechanical chopper to modulate the monochromatic light at a certain frequency of 10-100 Hz, and a single optical fiber. The acoustic signal from the sample was counted with an electret microphone connected to a preamplifier, a sound level meter unit, and a lock-in amplifier. 0.25, 0.5, and 1.0 mol% Ce-doped Y 3 Al 5 O 12 crystalline samples were evaluated for the performance test of the system. From the evaluation, an inverse correlation among fluorescence quantum efficiency, scintillation light yield, and PA signal was experimentally confirmed.

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Photoluminescence, photoacoustic, and scintillation properties of Te 4+ -doped Cs 2 HfCl 6 crystals

Cited by 30 publications

References 29 publications

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

Efficient Energy Transfer in Te⁴⁺-Doped Cs₂ZrCl₆ Vacancy-Ordered Perovskites and Ultrahigh Moisture Stability via A-Site Rb-Alloying Strategy

Development and Performance Test of Deep Ultraviolet–Visible Photoacoustic Spectroscopy System for Nonradiative Deactivation Characterization in Phosphor Materials

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Photoluminescence, photoacoustic, and scintillation properties of Te 4+ -doped Cs 2 HfCl 6 crystals

Cited by 30 publications

References 29 publications

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

Efficient Energy Transfer in Te4+-Doped Cs2ZrCl6 Vacancy-Ordered Perovskites and Ultrahigh Moisture Stability via A-Site Rb-Alloying Strategy

Development and Performance Test of Deep Ultraviolet–Visible Photoacoustic Spectroscopy System for Nonradiative Deactivation Characterization in Phosphor Materials

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Efficient Energy Transfer in Te⁴⁺-Doped Cs₂ZrCl₆ Vacancy-Ordered Perovskites and Ultrahigh Moisture Stability via A-Site Rb-Alloying Strategy