High Light Yield of Sr8(Si4O12)Cl8:Eu2+ under X-ray Excitation and Its Temperature-Dependent Luminescence Characteristics

Liu, Chunmeng; Qi, Zeming; Ma, Chong‐Geng; Dorenbos, P.; Hou, Dan; Zhang, Su; Kuang, Xiaojun; Zhang, Jianhui; Liang, H.

doi:10.1021/cm501055k

Cited by 107 publications

(91 citation statements)

References 35 publications

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“…As temperature increases, the X-ray excited luminescence intensity first decreases between 10 and 50 K, then increases towards 130 K, and reduces steadily at higher temperatures. In all crystals, the FWHM of X-ray excited luminescence peaks increases with increasing temperature, consistent with the spreading of excited electrons to high vibrational levels37.…”

Section: Resultssupporting

confidence: 74%

X-ray Scintillation in Lead Halide Perovskite Crystals

Birowosuto

Cortecchia

Drozdowski

et al. 2016

Sci Rep

323

333

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Current technologies for X-ray detection rely on scintillation from expensive inorganic crystals grown at high-temperature, which so far has hindered the development of large-area scintillator arrays. Thanks to the presence of heavy atoms, solution-grown hybrid lead halide perovskite single crystals exhibit short X-ray absorption length and excellent detection efficiency. Here we compare X-ray scintillator characteristics of three-dimensional (3D) MAPbI3 and MAPbBr3 and two-dimensional (2D) (EDBE)PbCl4 hybrid perovskite crystals. X-ray excited thermoluminescence measurements indicate the absence of deep traps and a very small density of shallow trap states, which lessens after-glow effects. All perovskite single crystals exhibit high X-ray excited luminescence yields of >120,000 photons/MeV at low temperature. Although thermal quenching is significant at room temperature, the large exciton binding energy of 2D (EDBE)PbCl4 significantly reduces thermal effects compared to 3D perovskites, and moderate light yield of 9,000 photons/MeV can be achieved even at room temperature. This highlights the potential of 2D metal halide perovskites for large-area and low-cost scintillator devices for medical, security and scientific applications.

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Section: Resultssupporting

confidence: 74%

X-ray Scintillation in Lead Halide Perovskite Crystals

Birowosuto

Cortecchia

Drozdowski

et al. 2016

Sci Rep

323

333

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“…The PL spectra of the KMg 4 (PO 4 ) 3 :0.06Eu 2+ phosphor present a 52.2nm full width at half-maximum (FWHM) broad blue emission band extending from 400 to 525nm peaking at 450nm, which is assigned to the 4 f 6 5 d –4 f 7 transition of the Eu 2+ ions. Moreover, The PL of KMg 4 (PO 4 ) 3 :0.06Eu 2+ detected under 365nm is similar to that under 300nm in addition to the difference of the relative intensity, which verifies that the Eu 2+ ions occupy the same lattice site (K + sites) in KMg 4 (PO 4 ) 3 host18. Above result is in accord with the conclusion from Rietveld refinement.…”

Section: Resultssupporting

confidence: 85%

“…The temperature-dependent of emission FWHM is related to the configuration coordinate model and the Boltzmann distribution, and can be expressed by:1829where W 0 is the FWHM at 0°C, hv represents the vibrational phonon energy, S means the Huang−Rhys parameter, and k is the Boltzmann constant. With the temperature increase, the excited electrons spread to higher vibration levels and the radiative transitions from these different levels cause the emission band broadening.…”

Section: Resultsmentioning

confidence: 99%

Crystal structure and Temperature-Dependent Luminescence Characteristics of KMg4(PO4)3:Eu2+ phosphor for White Light-emitting diodes

Chen

Liu

Mei

et al. 2015

Sci Rep

115

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The KMg4(PO4)3:Eu2+ phosphor was prepared by the conventional high temperature solid-state reaction. The crystal structure, luminescence and reflectance spectra, thermal stability, quantum efficiency and the application for N-UV LED were studied respectively. The phase formation and crystal structure of KMg4(PO4)3:Eu2+ were confirmed from the powder X-ray diffraction and the Rietveld refinement. The concentration quenching of Eu2+ in the KMg4(PO4)3 host was determined to be 1mol% and the quenching mechanism was certified to be the dipole–dipole interaction. The energy transfer critical distance of as-prepared phosphor was calculated to be about 35.84Å. Furthermore, the phosphor exhibited good thermal stability and the corresponding activation energy ΔE was reckoned to be 0.24eV. Upon excitation at 365nm, the internal quantum efficiency of the optimized KMg4(PO4)3:Eu2+ was estimated to be 50.44%. The white N-UV LEDs was fabricated via KMg4(PO4)3:Eu2+, green-emitting (Ba,Sr)2SiO4:Eu2+, and red-emitting CaAlSiN3:Eu2+ phosphors with a near-UV chip. The excellent color rendering index (Ra = 96) at a correlated color temperature (5227.08K) with CIE coordinates of x = 0.34, y = 0.35 of the WLED device indicates that KMg4(PO4)3:Eu2+ is a promising blue-emitting phosphor for white N-UV light emitting diodes (LEDs).

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“…Moreover, we also observed that the FWHM of the emission band increases from 54 nm to 75 nm as the temperature increased. The temperature-dependence of emission FWHM is related to the configuration coordinate model and the Boltzmann distribution, and can be expressed by: 88,89 …”

Section: Temperature-dependent Photoluminescence Behaviormentioning

confidence: 99%

ZnGeN₂ and ZnGeN₂:Mn²⁺ phosphors: hydrothermal-ammonolysis synthesis, structure and luminescence properties

et al. 2015

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Nitride phosphors have drawn much interest because of their outstanding thermal and chemical stability and interesting photoluminescence properties. Currently, it remains a challenge to synthesize these phosphors through a convenient chemical route. Herein we propose a general and convenient strategy based on hydrothermal-ammonolysis reaction to successfully prepare zinc germanium nitride (ZnGeN 2 ) and Mn 2+ doped ZnGeN 2 phosphors. The crystal structure, composition, morphology, luminescence and reflectance spectra, quantum efficiency, and the temperature-dependent photoluminescence behavior were studied respectively. The phase formation and crystal structure of ZnGeN 2 were confirmed from powder X-ray diffraction and Rietveld refinement. EDX analysis confirmed the actual atomic ratios of Zn/Ge and N/Ge and suggested the presence of Ge vacancy defects in the ZnGeN 2 host, which is associated with its yellow emission at 595 nm with a FWHM of 143 nm under UV light excitation. For Mn 2+ doped ZnGeN 2 phosphor, it exhibits an intense red emission due to the 4 T 1g -6 A 1g transition of Mn 2+ ions. The unusual red emission of Mn 2+ at the tetrahedral Zn 2+ sites is attributed to the strong nephelauxetic effect and crystal field between Mn 2+ and the tetrahedrally coordinated N 3À . Moreover, the PL intensity of ZnGeN 2 :Mn 2+ phosphors can be enhanced by Mg 2+ ions partially substituting for Zn 2+ ions in a certain concentration range. The optimal Mn 2+ doping concentration in the ZnGeN 2 host is 0.4 mol%. The critical energy transfer distance of this phosphor is calculated to be about 27.99 Å and the concentration quenching mechanism is proved to be the dipole-dipole interaction. With increasing temperature, the luminescence of ZnGeN 2 :Mn 2+ phosphors gradually decreases and the FWHM of the emission band broadens from 54 nm to 75 nm. The corresponding activation energy E a was reckoned to be 0.395 eV. And the nonradiative transition probability increases with the increasing temperature, finally leading to the lifetime decrease with the increase of the temperature.

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High Light Yield of Sr₈(Si₄O₁₂)Cl₈:Eu²⁺ under X-ray Excitation and Its Temperature-Dependent Luminescence Characteristics

Cited by 107 publications

References 35 publications

X-ray Scintillation in Lead Halide Perovskite Crystals

X-ray Scintillation in Lead Halide Perovskite Crystals

Crystal structure and Temperature-Dependent Luminescence Characteristics of KMg4(PO4)3:Eu2+ phosphor for White Light-emitting diodes

ZnGeN₂ and ZnGeN₂:Mn²⁺ phosphors: hydrothermal-ammonolysis synthesis, structure and luminescence properties

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High Light Yield of Sr8(Si4O12)Cl8:Eu2+ under X-ray Excitation and Its Temperature-Dependent Luminescence Characteristics

Cited by 107 publications

References 35 publications

X-ray Scintillation in Lead Halide Perovskite Crystals

X-ray Scintillation in Lead Halide Perovskite Crystals

Crystal structure and Temperature-Dependent Luminescence Characteristics of KMg4(PO4)3:Eu2+ phosphor for White Light-emitting diodes

ZnGeN2 and ZnGeN2:Mn2+ phosphors: hydrothermal-ammonolysis synthesis, structure and luminescence properties

Contact Info

Product

Resources

About

High Light Yield of Sr₈(Si₄O₁₂)Cl₈:Eu²⁺ under X-ray Excitation and Its Temperature-Dependent Luminescence Characteristics

ZnGeN₂ and ZnGeN₂:Mn²⁺ phosphors: hydrothermal-ammonolysis synthesis, structure and luminescence properties