{"id":3363,"date":"2020-02-17T14:06:38","date_gmt":"2020-02-17T14:06:38","guid":{"rendered":"https:\/\/www.editage.com\/insights\/towards-a-sustainable-future-novel-technology-to-measure-energy-conversion-efficiency\/"},"modified":"2025-02-19T05:53:09","modified_gmt":"2025-02-19T05:53:09","slug":"towards-a-sustainable-future-novel-technology-to-measure-energy-conversion-efficiency","status":"publish","type":"post","link":"https:\/\/www.editage.com\/insights\/towards-a-sustainable-future-novel-technology-to-measure-energy-conversion-efficiency","title":{"rendered":"Towards a sustainable future: Novel technology to measure energy conversion efficiency"},"content":{"rendered":"

Energy is in a constant universal cycle of use, reform, and reuse. Through this process, there are often several situations where energy is received in one form and converted to another form, or even to a non-energy form; photosynthesis is an apt example for this. In this process, as we know, the sun\u2019s energy, in the form of sunlight, falls on leaves, and leaves convert this solar energy into other forms of stored energy through a set of reactions. <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

But, what is the efficiency of this energy conversion? To put in simple terms, energy conversion efficiency is the ratio of useful output of an energy-converting system like a plant and the total energy that it receives in the first place. This value is important especially in the planning of energy-efficient structures like solar cells. However, although the theory is simple, there is no established method to accurately measure factors that determine light energy conversion efficiency, like total energy or total electrical power generated.<\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

One alternative technique that has been explored for solving this issue is the measurement of heat over light. Everything that absorbs energy tends to dissipate that energy in the form of heat. This release of heat is greater immediately following energy absorption and reduces as time passes. This is in contrast with light emission by systems like \u201cphosphorescent\u201d or glow-in-the-dark materials, which absorb energy and only release light much later. Therefore, measuring heat release as a function of excitation light wavelength\u2014or to use the technical term, the \u201cphotothermal excitation spectrum\u201d or PTES\u2014can be a viable method to measure energy conversion efficiency. Photothermal deflection spectroscopy is one method for the direct application of PTES.<\/span> However, very little research has investigated PTES independently of light emission.<\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

Scientists at the Tokyo University of Science, Japan decided to address this knowledge<\/a> gap. This team of scientists led by Prof Eiji Tokunaga\u00a0had previously created a Sagnac interferometer photothermal deflection spectroscopy (SIPDS) technique, which improved the efficiency of the existing techniques by one magnitude.<\/span> Photothermal spectroscopy detects the heat generated when the irradiated light is absorbed by the sample, and therefore, it can measure the absorption spectrum for samples of any shape and with any properties, such as \u201cscatterers\u201d whose transmitted light cannot be measured. <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

Prof Tokunaga says, \u201cSince about 2010, we have been working on increasing the sensitivity of photothermal deflection spectroscopy using an interferometer, and with the collective efforts of everyone including students, we could analyze samples in air that have seldom been analyzed before, giving us the ability to measure the absorption spectrum over the entire visible light range<\/i>.\u201d <\/span>\u00a0Why was this so important? \u201cThis upgraded technology<\/i>,\u201d states Prof Tokunaga, \u201cenabled us to evaluate the quantum efficiency of luminescence or chemical energy conversion<\/i>.\u201d <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

\"A<\/span><\/span><\/span><\/span><\/p>\n

Taking this technology another step forward, these scientists, along with Dr Kohsei Takahashi and Dr Naoto Hirosaki from the Sialon Group, National Institute for Materials Science (NIMS), have now integrated \u201cbalanced detection,\u201d which is essentially a technique to measure small variances in values, into their SIPDS technology. This new innovation uses a white-light lamp as a source of energy and can measure the photothermal excitation spectrum of materials in the air. <\/span>The scientists noticed that no heat is generated, meaning that light energy is converted to effective energy, so the difference from the absorption spectrum could be measured to determine the light energy conversion efficiency. <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

They were able to use this technology to measure the heat spectrum (PTES) of a high-efficiency luminescent red phosphor of white LED, made by NIMS, successfully and compared it with their photoluminescence excitation spectrum (PLES), which showed the amount of light emitted by the phosphor as a function of excitation light wavelength (Figure). This comparison provided accurate photoluminescence efficiency values of the phosphor as well, which is a measure of how well a substance can emit light. \u201cWe can use our technology to measure the thermal relaxation spectra of materials over the whole visible range in the weak excitation limit 50 \u00b5W\/cm2<\/sup>, which is a never-before-achieved breakthrough<\/i>,\u201d remarks Prof Tokunaga. <\/span>Thus, the measurement of energy conversion efficiency, which had previously required expensive and different devices such as phosphors, solar cells, and photosynthesis (to measure the converted effective energy [emission energy, electrical energy, chemical energy]), could be done using one simple, unified method.<\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

The future prospects of this technology are exciting: once developed further, measuring the energy conversion efficiency of even photosynthesis in \u201clive\u201d leaves can be performed. Hopefully, these findings can stimulate and accelerate research aimed at improving the conversion efficiency of substances and realize a society with high energy conversion efficiency. <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

Reference<\/span><\/b><\/span><\/span><\/p>\n

Title of original paper: T<\/span>hermal Relaxation Spectra for evaluating luminescence quantum efficiency of CASN:Eu2+ <\/sup>measured by Balanced-Detection Sagnac-Interferometer Photothermal Deflection Spectroscopy<\/span><\/span><\/span><\/span><\/p>\n

Journal:\u00a0<\/font>Applied Sciences<\/span><\/span><\/i><\/span><\/span><\/p>\n

DOI:\u00a0<\/font>10.3390\/app10031008<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

About <\/b>The Tokyo University of Science<\/b><\/span><\/span><\/span><\/p>\n

Tokyo University of Science<\/a> (TUS) is a well-known and respected university, and the largest science-specialized private research university in Japan, with four campuses in central Tokyo and its suburbs and in Hokkaido. Established in 1881, the university has continually contributed to Japan’s development in science through inculcating the love for science in researchers, technicians, and educators. <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/span><\/p>\n

With a mission of \u201cCreating science and technology for the harmonious development of nature, human beings, and society”, TUS has undertaken a wide range of research from basic to applied science. TUS has embraced a multidisciplinary approach to research and undertaken intensive study in some of today’s most vital fields. TUS is a meritocracy where the best in science is recognized and nurtured. It is the only private university in Japan that has produced a Nobel Prize winner and the only private university in Asia to produce Nobel Prize winners within the natural sciences field. <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

About Professor Eiji Tokunaga from Tokyo University of Science<\/b><\/span><\/span><\/span><\/p>\n

Dr Eiji Tokunaga is a Professor at the Faculty of Science Division I, Department of Physics of the Tokyo University of Science. He completed his undergraduate, postgraduate, and doctoral education at the University of Tokyo. A respected and senior researcher, he has more than 82 publications to his name. He works with his team to explore optical spectroscopy and condensed matter physics. \u00a0<\/span><\/span>Having spent <\/span><\/span><\/span>almost three decades\u00a0in these fields, Prof Tokunaga has introduced several new concepts related to the\u00a0optical properties of materials. His research <\/span><\/span>can be found here<\/a><\/span><\/span><\/span>.<\/span><\/span><\/span>\u3000<\/span><\/span><\/p>\n

\u00a0<\/p>\n

Funding information <\/span><\/b><\/span><\/span><\/p>\n

This research was partly funded by Ichimura Foundation for New Technology.<\/span><\/span><\/span>
\u00a0<\/p>\n

Media contact<\/strong><\/p>\n

Tsutomu Shimizu <\/span><\/span><\/span><\/span><\/p>\n

Email: mediaoffice@admin.tus.ac.jp<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Energy is in a constant universal cycle of use, reform, and reuse. Through this process, there are often several situations where energy is received in one form and converted to another form, or even to a non-energy form; photosynthesis is an apt example for this. In this process, as we know, the sun\u2019s energy, in […]<\/p>\n","protected":false},"author":1152,"featured_media":33313,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2435],"tags":[2482],"new_categories":[],"new_tags":[],"series":[],"class_list":["post-3363","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trending-research","tag-science-update"],"acf":[],"yoast_head":"\nTowards a sustainable future: Novel technology to measure energy conversion efficiency | Editage Insights<\/title>\n<meta name=\"description\" content=\"Researchers at Tokyo University of Science formulated an innovation that can measure thermal energy to understand more about the processes of energy-converting systems\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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