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Author

Ryohei Oka

Observed names: 39546, Oka, Ryohei, Ryohei OKA, 岡, 亮平
ORCID: 0000-0002-3831-772X
Observed ORCID: 0000-0002-3831-772X
OpenAlex ID: A5029747449
Eu 3+ Site Distribution and Local Distortion of Photoluminescent Ca 3 WO 6 :(Eu 3+ , K + ) Double Perovskites as High‐Color‐Purity Red Phosphors
2023 · Takahito Otsuka, Ryohei Oka, et al. · Advanced Science · 78
Synthesis and characterization of black pigments based on calcium manganese oxides for high near-infrared (NIR) reflectance
2016 · Ryohei Oka, Toshiyuki Masui · RSC Advances · 57
Novel near-infrared reflective black inorganic pigment based on cerium vanadate
2022 · Takuro Moriomoto, Ryohei Oka, et al. · RSC Advances · 44
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Improvement of near-infrared (NIR) reflectivity and black color tone by doping Zn 2+ into the Ca 2 Mn 0.85 Ti 0.15 O 4 structure
2019 · Ryohei Oka, Senri Iwasaki, et al. · RSC Advances · 36
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Synthesis and characterization of Bi 4 Zr 3 O 12 as an environment-friendly inorganic yellow pigment
2017 · Takashi Tsukimori, Ryohei Oka, et al. · Dyes and Pigments · 28
Synthesis and Color Evaluation of Ta5+-Doped Bi2O3
2019 · Ryohei Oka, Yusuke Shobu, et al. · ACS Omega · 18
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Synthesis and characterisation of Ba(Zn 1−x Co x ) 2 Si 2 O 7 (0 ≤ x ≤ 0.50) for blue-violet inorganic pigments
2018 · Takashi Tsukimori, Yusuke Shobu, et al. · RSC Advances · 18
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Synthesis and characterisation of SrY 2−x Ce x O 4 as environmentally friendly reddish-brown pigments
2017 · Ryohei Oka, Yusuke Shobu, et al. · RSC Advances · 18
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Raman Spectroscopic Investigation and Electronic State Calculation for Ca2(Mn,Ti)O4 Black Pigments with High Near-Infrared (NIR) Reflectivity
2022 · Ryohei Oka, Tomokatsu Hayakawa · Inorganic Chemistry · 17
Perovskite-type ALnO3 (A = Ca, Sr, Ba; Ln = Ce, Pr, Tb) oxides as environmentally friendly yellow pigments
2017 · Ryohei OKA, Takashi TSUKIMORI, et al. · Journal of the Ceramic Society of Japan · 17
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Synthesis and Characterization of Ca1– x Eu x ZrO3 as Environmentally Friendly Inorganic Yellow Pigments
2021 · Kohei Minagawa, Yuichi Nishiguchi, et al. · ACS Omega · 16
Effect of [MnO6] Octahedra to the Coloring Mechanism of (Li1– x Na x )2MnO3
2020 · Ryohei Oka, Kohei Kusukami, et al. · ACS Omega · 15
Tuning the luminescence color of Eu3+- and alkali-ion-codoped Sr2CaWO6 orange-red phosphors: Eu3+ site distribution and site-selective photoluminescence studies
2024 · Takahito Otsuka, Ryohei Oka, et al. · APL Materials · 11
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Color Controllable Inorganic Pigments with Ce 3+ as a Color Source
2023 · Kazuki Yamaguchi, Yusuke Shobu, et al. · Inorganic Chemistry · 10
A novel inorganic violet pigment based on zinc niobate
2023 · Kazuki Ohnishi, Ryohei Oka, et al. · Materials Advances · 10
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Structure–property relationships in Bi2O3–TiO2–B2O3 glasses modified with BaO: toward lead–free radiation shielding materials
2025 · Hongyi Deng, Rongguang Gan, et al. · Ceramics International · 9
Local Structural Investigation of Near-Infrared-Reflective Black Ca2(Mn,Ti)O4 Pigments Using Synchrotron Radiation X-Ray and Density Functional Theory Calculations
2023 · Ryohei Oka, Tomokatsu Hayakawa · Inorganic Chemistry · 9
Synthesis and Color Evaluation of Tb4+-Doped Na2ZrO3 for Inorganic Yellow Pigments
2022 · Ryohei Oka, Tomoyo Nouchi, et al. · Colorants · 7
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Inorganic Green Pigments Based on LaSr2AlO5
2023 · Kazuki Yamaguchi, Akari Takemura, et al. · Ceramics · 6
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Novel Environmentally Friendly Inorganic Orange Pigments Based on Ca14Al10Zn6O35
2018 · Ryohei Oka, Takashi Kosaya, et al. · Chemistry Letters · 6
Novel Findings on the Optical Properties of Mn4+‐Doped (Rb,K)2Ge4O9 Phosphors
2022 · Ryohei Oka, Daiki Nishi, et al. · physica status solidi (b) · 5
Photoluminescence Color Prediction for Eu3+‐Doped Perovskite Red Phosphors Using Machine Learning
2023 · Takahito Otsuka, Ryohei Oka, et al. · physica status solidi (RRL) - Rapid Research Letters · 4
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Novel Orange Color Pigments Based on La3LiMnO7
2021 · Ryohei Oka, Jun-ichi Koyama, et al. · Molecules · 4
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Enhancement of near-infrared emission of neodymium-doped monoclinic gadolinium phosphate nanophosphors by surface coating with calcium phosphate
2019 · Mizuki Watanabe, Norifumi Yamamoto, et al. · Journal of Asian Ceramic Societies · 4
Control of Optical Reflection in Ca2MgWO6 by Co and Mo Doping
2024 · Kazuki Yamaguchi, Kohei Minagawa, et al. · Molecules · 2
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Works count: 39
Citation count: 459
H-index: 12
I10-index: 15
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