Prussian blue is a blue pigment used from 18th century. Prussian blue has been studied for several applications including radioactive cesium adsorbent, electrochromic device, reusable battery, because of porous crystal structure. In this paper, we will introduce the ammonia adsorbent property of Prussian blue and a demonstration in pig farm for odor removal.

Current state of the art and prospects for diamond semiconductors are described, focusing on a summary of the technical issues related to the establishment of wafer production for industrial usage, making use of the physical constants of single diamond crystals in industry.

New phosphor materials and flexible phosphor films were developed by thermal / photo-assisted reaction of metal organic deposition (MOD), resulting in highly water-resistant, high-luminance red light-emitting materials and phosphorescent materials that emit high-luminance light when excited by LEDs. By using the photo MOD, high brightness white phosphor film and phosphorescent film were developed on a flexible substrate. The binder-free phosphor films developed by ELAMOD showed high brightness emission and high durability at high temperature and high humidity.

The oceans are a large reservoir of carbon dioxide. Monitoring ocean carbon dioxide system is essential for predicting the future of global warming. There is also concern that absorbed carbon dioxide could acidify the oceans and affect the ecosystem. In recent years, carbon dioxide capture and storage (CCS) and other ocean-based projects have been under consideration, and demand for monitoring of carbon dioxide system in the ocean is increasing. High-precision colorimetric method for the determination of pH has been standardized internationally. However, there are issues with the availability of high-purity dye reagents and reference materials required for measurement.

The known cases of fire and explosion are explained, from the perspective of “is your laboratory unrelated to explosions?”.

In the present paper we aim to raise awareness of the risks lurking in science laboratories and also briefly introduce the measures to deal with such risks.

High performance perovskite solar cells with p-type semiconducting copolymer as hole transporting layer (HTL) were fabricated and evaluated. In case of dithiophene-benzene copolymer, we found p-type doping effect of oxygen and tris(pentafluorophenyl)borane on HTL. In case of donor-acceptor copolymer, we found suppression of recombination at perovskite/HTL interface by inserting passivation layer, leading to improvement of cell performance.

Recently, the loss of vegetation by disposal of unsaleable vegetables and deforestation has been increasing every year and has become a global environmental problem from the viewpoint of an increase in the environmental load. In the environmentally friendly energy field, new renewable energy sources are strongly desired in addition to solar, wind, geothermal power generation, and so on. In order to solve these problems simultaneously, we have focused on the attractive advantages whereby leaves produce oxygen and hydrogen by photosynthesis and create beautiful architectural space with natural green color, and have produced “Photosynthetic architecture”. In the present paper, the energy-generation mechanism, and the concept and actual examples of photosynthetic architecture are presented.