? Optical spectroscopic study on the electronic structure of SrHfO3

Lee, D. J.; Seo, Yuichi; Lee, Y. S.

doi:10.3938/jkps.56.366

Cited by 7 publications

(4 citation statements)

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“…Signatures of this effect may be accessible through a combination of optical and scattering experiments. For SrHfO 3 , isostructural to SrIrO 3 , optical mode frequencies have been calculated 26 using density functional perturbation theory (DFPT), which are comparable with experimental Raman 25,39 , and IR reflectivity 39 studies. In the case of SrIrO 3 , high pressures are necessary to achieve the orthorhombic perovskite structure 19 , and as a consequence there are only a small number of bulk experiments available 20,21,[40][41][42] .…”

Section: Discussionmentioning

confidence: 76%

Selective phonon damping in topological semimetals

Gordon

2018

Phys. Rev. B

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Topological semimetals are characterized by their intriguing Fermi surfaces (FSs) such as Weyl and Dirac points, or nodal FS, and their associated surface states. Among them, topological crystalline semimetals, in the presence of strong spin-orbit coupling, possess a nodal FS protected by nonsymmorphic lattice symmetries. In particular, it was theoretically proposed that SrIrO3 exhibits a bulk nodal ring due to glide symmetries, as well as flat two-dimensional surface states related to chiral and mirror symmetries. However, due to the semimetallic nature of the bulk, direct observation of these surface states is difficult. Here we study the effect of flat-surface states on phonon modes for SrIrO3 side surfaces. We show that mirror odd optical surface phonon modes are damped at the zone center, as a result of coupling to the surface states with different mirror parities, while even modes are unaffected. This observation could be used to infer their existence, and experimental techniques for such measurements are also discussed. arXiv:1802.04300v2 [cond-mat.str-el]

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Section: Discussionmentioning

confidence: 76%

Selective phonon damping in topological semimetals

Gordon

2018

Phys. Rev. B

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“…On the other hand, the decay curves monitoring at 1000 and 1100 nm show a single exponential function. As there is only one crystallography site for Cr 3+ ions, the two fluorescence centers are therefore assigned to the SHO host (i.e., self-trapped excitons) 21,22 and Cr 3+ ions. As the emis-sion of 1000 or 1100 nm is far apart from the self-emission of the host, the single fluorescence lifetime is thus only contributed by Cr 3+ .…”

Section: Photoluminescence Properties Of Sho:crmentioning

confidence: 99%

“…SHO has a perovskite structure and is a valuable candidate for use as a high-k dielectric material and in the next generation of CMOS devices. 21 In addition, SHO itself can emit NIR light in the range of 700-800 nm owing to the self-trapped excitons, but the luminous efficiency is not mentioned in the article. 22 By accommodating Cr 3+ into the Hf 4+ sites, we find that SHO:Cr 3+ shows an additional NIR emission of Cr 3+ with a peak wavelength of 1000 nm and an FWHM of 190 nm.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we propose a new approach to realize super‐broad NIR emission by doping Cr 3+ in self‐emitting SrHfO 3 (SHO). SHO has a perovskite structure and is a valuable candidate for use as a high‐ k dielectric material and in the next generation of CMOS devices 21 . In addition, SHO itself can emit NIR light in the range of 700–800 nm owing to the self‐trapped excitons, but the luminous efficiency is not mentioned in the article 22 .…”

Section: Introductionmentioning

confidence: 99%

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Ultrawide near‐infrared SrHfO₃:Cr³⁺ phosphor with dual emission bands

et al. 2023

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Near‐infrared phosphor‐converted light‐emitting diodes (NIR‐pc‐LEDs) are superior to traditional NIR‐LEDs in spectral modulation, volume, and cost, and their optoelectronic properties are dominantly controlled by the NIR phosphors, which thus boosts the search for high efficiency and broadband NIR phosphors. In this work, we attempt to realize ultra‐broadband NIR phosphors by doping Cr3+ in self‐emitting SrHfO3 with a weak crystal field. Dual emission bands centered at 770 (host) and 1000 nm (Cr3+) are observed, leading to a wide spectral range of 700–1400 nm. The Cr3+ ions enter the HfO6 octahedron and thus produce an NIR emission with a full width at half maximum of 190 nm and an internal quantum efficiency of 24% under 460 nm excitation. A prototype NIR‐pc‐LED surface light is demonstrated for machine vision by using NIR‐pc‐LEDs that combine the blue LED with SrHfO3:Cr. The work paves an avenue for designing super‐broadband NIR phosphors by doping Cr3+ or other ions into hosts with self‐trapped exciton emission (e.g., halide perovskites).

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