Kenzo Deguchi

Highly Fluorescent Phenyl‐Modified Carbon Nitride Microcavities for Rare‐Earth‐Free Whispering‐Gallery‐Mode Emission and Unclonable Photonic Anti‐Counterfeiting

Barun Kumar Barman, Keisuke Watanabe, Adrija Das, Hiroyuki Yamada et autres

ABSTRACT Graphitic carbon nitride (g‐C 3 N 4 ), a two‐dimensional, rare‐earth‐ and metal‐free semiconducting material, exhibits promising optoelectronic properties. However, its photonic behavior via strong light‐matter interaction remains rather unexplored, limiting its application in advanced luminescent devices. Here, we demonstrate that …

jp, in (code pays fourni par la source)

Chameleonic Color‐Variable Microbead Emitters for Multilevel Spectroscopic Encryption from Visible to Infrared Wavelengths

Barun Kumar Barman, Keisuke Watanabe, Kenzo Deguchi, Shinobu Ohki et autres

ABSTRACT Whispering‐gallery‐mode (WGM)‐mediated light emission produces sharp and distinct resonant peaks, providing a unique spectral signature that is ideal for photonic barcoding and compact microtagging. However, existing photonic barcodes are typically limited to visible wavelengths, restricting their tagging potential. Achieving precise light‐emission …

jp, in (code pays fourni par la source)

Bulk Amorphous Alumina: The Density-Driven Interplay of Pentahedral Pyramids and Octahedra for High Dielectric Permittivity

Hideki Hashimoto, Yohei Onodera, Rei Okuno, Masashi Miyakawa et autres

The synthesis of single-component oxide glasses, represented by Al 2 O 3 (alumina), is an unexplored area because they have no glass-forming ability. We synthesized a transparent bulk amorphous alumina with excellent thermal conductivity, hardness, and dielectric permittivity by applying high pressure …

jp (code pays fourni par la source)

Metal-Free, Single-Component White-Light Emission and Visible-Near-Infrared Whispering Gallery Mode Micro-Emitter

Barun Kumar Barman, Keisuke Watanabe, Vijayakumar Balakrishnan, Keiko Okano et autres

Single-component, metal-free white light emitters with integrated photonic functionalities are highly attractive for solid-state lighting and integrated photonic applications. Here, we report carbonized polymer microspheres that exhibit efficient singlecomponent white...

Tracing nitridation reaction toward efficient production of oxynitride glasses as hosts for bright luminescence centers

Xun Liu, Takeo Ohsawa, Noriko Saito, Kohsei Takahashi et autres

Europium-doped oxynitride glass powder (Sr-Si-Al-O-N) was synthesized by a sol-gel method followed by ammonolysis to investigate the effect of the ammonolysis conditions on the structure and properties of the glass powder.In particular, the effect of the ammonia gas flow rate during nitridation …

jp (code pays fourni par la source)

Effect of P2O5 addition on the structure of Na2O–Y2O3–SiO2 glasses and glass-ceramics

Ryuichi Maekawa, Koji Kawada, Koji Yazawa, Kenzo Deguchi et autres

jp (code pays fourni par la source)

Effects of composition, grinding, and heat treatment on the coloration of alkali borosilicate glasses

Yuto Okawara, Koji Kawada, Yuuka Kokubo, Aiko Shimada et autres

jp (code pays fourni par la source)

Sulfated cellulose pulp with ultra-high water retention characteristics

Sakura Morimitsu, Ayato Nishimura, Kenzo Deguchi, Yuuki Mogami et autres

jp (code pays fourni par la source)

Synthesis of mesoporous SiO2–Al2O3 hollow spheres using ultrasonic irradiation and their activity for hydrolysis of ammonia borane

Naoki Toyama, Toshiyuki Nagashima, Kenzo Deguchi, Shinobu Ohki et autres

In this study, mesoporous silica–alumina (SiO 2 –Al 2 O 3 ) hollow spheres (HSs) were synthesized through ultrasonic irradiation and evaluated in terms of their activity for the hydrolysis of ammonia borane (NH 3 BH 3 ). The mesoporous SiO 2 …

jp (code pays fourni par la source)

Amorphous alumina: an ideal material for advancing pentacoordinated aluminum chemistry and verifying its catalytic properties

Rei Okuno, Tetsuya Kinjo, Zen Maeno, Hirooki Kajiwara et autres

jp (code pays fourni par la source)

Electrically conductive charge-segregated pseudo-polymorphs comprising highly planar expanded π-electronic cations

Yohei Haketa, Yuto Maruyama, Hiroki Tanaka, Wookjin Choi et autres

complex. XRD and solid-state NMR measurements, along with molecular dynamics (MD) simulation, revealed that the LeC states were formed by a less-ordered arrangement of constituting ions induced by bulky counteranions. The electric conductivity properties were observed in the single-crystal and LeC charge-segregated …

jp (code pays fourni par la source)

Sulfated cellulose pulp with ultra-high water retention characteristics

Sakura Morimitsu, Ayato Nishimura, Kenzo Deguchi, Yuuki Mogami et autres

jp (code pays fourni par la source)