{"id":3614,"date":"2020-09-08T15:05:14","date_gmt":"2020-09-08T15:05:14","guid":{"rendered":"https:\/\/www.editage.com\/insights\/a-new-way-of-modulating-color-emissions-from-transparent-films\/"},"modified":"2025-04-04T09:15:15","modified_gmt":"2025-04-04T09:15:15","slug":"a-new-way-of-modulating-color-emissions-from-transparent-films","status":"publish","type":"post","link":"https:\/\/www.editage.com\/insights\/a-new-way-of-modulating-color-emissions-from-transparent-films","title":{"rendered":"A new way of modulating color emissions from transparent films"},"content":{"rendered":"

Scientists are looking at luminescent transparent films for use in energy-efficient displays (such as LED screens) and other applications, and the possibilities it opens up for advancing methodologies in several fields of biological and electronics research. However, although multicolor-emitting transparent solid films have been developed, finding efficient ways to tune the color and intensity of light emissions has been challenging. <\/span><\/span><\/span><\/span><\/p>\n

Now, in a recent paper published in\u00a0The Royal Society of Chemistry\u2019s Materials Advances<\/i><\/a>, a novel mechanism for easily tuning the luminescence of a newly modified light-emitting solid transparent material is described\u2014it involves simply modulating its proton concentration (or pH) via the application of a voltage.<\/span><\/span><\/span><\/span><\/p>\n

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

This material was developed in the lab of Professor Makoto Tadokoro, an inorganic chemist and materials scientist at Tokyo University of Science in Japan. Prof Tadokoro and his team, including Dr. Hajime Kamebuchi from Nihon University, Japan, and Mr. Taiho Yoshioka from Tokyo University of Science, began with a transparent polymeric film called Nafion. Nafion films are well-known as proton-conductors (materials in which electricity is conducted via the movement of protons) and cation exchangers (materials that readily attract positively charged particles). These two properties proved key to the luminescence control afforded by the material that it would eventually help form.<\/span><\/span><\/span><\/span><\/p>\n

A third property of Nafion that made it even more useful for Prof Tadokoro\u2019s team is its molecular structure. Nafion\u2019s structure allowed \u201ccomplexes\u201d of two metals, terbium (Tb) and europium (Eu), which are known to be light emitters, to be embedded in it when it was dipped in a solution containing the metal complexes. Thus, the fabrication process of the material was simple and inexpensive.<\/span><\/span><\/span><\/span><\/p>\n

When the final product\u2014a metal-complex-containing polymeric film\u2014was immersed in an acidic solution (pH 2\u20135; proton donor), it turned green. Soaked in an alkaline solution (pH 9\u201312; proton acceptor), it turned red. In a neutral solution (pH 6\u20138), it turned yellow (a combination of red and green). <\/span><\/span><\/span><\/span><\/p>\n

Spectroscopic analysis told the authors why these specific color changes were occurring. In acidic solutions, the protons taken up by Nafion were \u2018turning on\u2019 the Tb metal ions, but not the Eu metal ions. In alkaline solutions, Eu metal ions took the spotlight and emissions from the Tb ions were quenched. In neutral solutions, both emitted light. This confirmed that the proton concentration gradient within the material determined its luminescence. <\/span><\/span><\/span><\/span><\/p>\n

The scientists were then able to easily tune the luminescence by hooking the material to a battery after dipping it in an acidic solution. The acidic solution made the material green. But upon application of a voltage, as protons moved towards the negatively charged side of the material, the proton-deficient positively charged side began to turn red. The central portion of the material became yellow. Prof Tadokoro says, \u201cWe think that this was the most challenging part of our study\u2014and incidentally also our biggest success. The finding that the flow of protons in a solid medium under an electric field can be controlled, which in turn allows us to control the \u2018color\u2019 of emitted light, is unprecedented. In biological systems, ion flows are responsible for many essential biochemical activities. The \u2018solid-state ionics\u2019 demonstrated by us can find applications in a lot of different fields.<\/i>\u201d <\/i><\/span><\/span><\/span><\/span><\/p>\n

When further asked about the practical significance of his work, Prof Tadokoro says, \u201c<\/i><\/span>Our findings show that it is possible to fabricate inexpensive multicolor emitting glass or film materials whose emissions can be tuned by simply applying a voltage to control the proton <\/span><\/i>flow, and therefore proton gradient,<\/span><\/i> within the material. In other words, not only electron conduction, but proton conduction can be a way in which the luminescence of materials is controlled.\u201d<\/span><\/i> <\/span><\/span><\/span><\/p>\n

But, while this study is a big step in the journey to achieving <\/span>t<\/span>ransparent emitters for a wide range of applications\u2014such as detecting pH gradients in biological cells or constructing novel displays and illuminators\u2014the device developed here is not quite ready for the market. Prof Tadokoro says, \u201cWe are now trying to add a blue light emitting complex into our system, so that we can obtain a material that can emit light over the entire visible spectrum.\u201d<\/i> <\/span><\/span><\/span><\/span><\/p>\n

Once that is achieved, the sciences will be advanced a little bit more, and a new generation of highly tunable multicolor-emitting materials may not be too far away! <\/span><\/span><\/span><\/span><\/p>\n

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

Titles of original papers: Development of tuneable green-to-red emitting transparent film based on Nafion with TbIII\/EuIII\u00a0\u03b2-diketonate complexes modulated by pH and proton flow<\/span><\/span><\/span><\/span><\/p>\n

Journal<\/span>: Materials Advances<\/span><\/i><\/span><\/span><\/p>\n

DOI: <\/span><\/span>10.1039\/d0ma00237b<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

About <\/b>the Tokyo University of Science<\/b><\/span><\/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

About Professor Makoto Tadokoro from Tokyo University of Science<\/b><\/span><\/span><\/span><\/span><\/p>\n

Dr Makoto Tadokoro is a Professor at the Department of Chemistry, Tokyo University of Science. He is an inorganic chemist and a materials scientist, with research interests in supramolecular coordination chemistry, protonics, water science, and organic molecular conductors. With over 160 publications to his name, he is also affiliated with various leading organizations in the field, such as the Chemical Society of Japan, and has won several awards for his work. <\/span><\/span><\/span><\/span><\/p>\n

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

The research was funded by the Sasakawa Scientific Research Grant from The Japan Science Society (28-341), the Tokyo Institute of Technology Foundation Research and Educational Grants (28-036), a grant from The Mazda Foundation (16KK-354), a grant from Izumi Science and Technology Foundation (H29-J-109), and a grant from Iketani Science and Technology Foundation (0301067-A). <\/span><\/span><\/span><\/span><\/p>\n

Media contact <\/span><\/b><\/span><\/span><\/span><\/p>\n

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

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

Scientists are looking at luminescent transparent films for use in energy-efficient displays (such as LED screens) and other applications, and the possibilities it opens up for advancing methodologies in several fields of biological and electronics research. However, although multicolor-emitting transparent solid films have been developed, finding efficient ways to tune the color and intensity of […]<\/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-3614","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trending-research","tag-science-update"],"acf":[],"yoast_head":"\nA new way of modulating color emissions from transparent films | Editage Insights<\/title>\n<meta name=\"description\" content=\"Transparent luminescent materials have several applications; but so far, few multicolor light\u2013emitting solid transparent materials exist in which the color of emission is tunable. 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Their study provides fresh insights into the creation of more efficient multicolor transparent luminescent materials.","breadcrumb":{"@id":"https:\/\/www.editage.com\/insights\/a-new-way-of-modulating-color-emissions-from-transparent-films#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.editage.com\/insights\/a-new-way-of-modulating-color-emissions-from-transparent-films"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.editage.com\/insights\/a-new-way-of-modulating-color-emissions-from-transparent-films#primaryimage","url":"https:\/\/www.editage.com\/insights\/wp-content\/uploads\/2025\/02\/editage-insights-generic-banner_298.webp","contentUrl":"https:\/\/www.editage.com\/insights\/wp-content\/uploads\/2025\/02\/editage-insights-generic-banner_298.webp","width":656,"height":336},{"@type":"BreadcrumbList","@id":"https:\/\/www.editage.com\/insights\/a-new-way-of-modulating-color-emissions-from-transparent-films#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.editage.com\/insights\/"},{"@type":"ListItem","position":2,"name":"A new way of modulating color emissions from transparent films"}]},{"@type":"WebSite","@id":"https:\/\/www.editage.com\/insights\/#website","url":"https:\/\/www.editage.com\/insights\/","name":"Editage Insights","description":"","publisher":{"@id":"https:\/\/www.editage.com\/insights\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.editage.com\/insights\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.editage.com\/insights\/#organization","name":"Editage Insights","url":"https:\/\/www.editage.com\/insights\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.editage.com\/insights\/#\/schema\/logo\/image\/","url":"https:\/\/www.editage.com\/insights\/wp-content\/uploads\/2024\/09\/editage-insights-logo-1-scaled.webp","contentUrl":"https:\/\/www.editage.com\/insights\/wp-content\/uploads\/2024\/09\/editage-insights-logo-1-scaled.webp","width":2560,"height":324,"caption":"Editage Insights"},"image":{"@id":"https:\/\/www.editage.com\/insights\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/Editage","https:\/\/x.com\/Editage"]},{"@type":"Person","@id":"https:\/\/www.editage.com\/insights\/#\/schema\/person\/cbcaf87b3854025dbc992cc0df30714d","name":"Impact Science","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.editage.com\/insights\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/6b2b71ce8a6c1056a3435be210d1bd34462c1c442ee7ce9c426896ad8ccd0763?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/6b2b71ce8a6c1056a3435be210d1bd34462c1c442ee7ce9c426896ad8ccd0763?s=96&d=mm&r=g","caption":"Impact Science"},"url":"https:\/\/www.editage.com\/insights\/editage-research-communication"}]}},"_links":{"self":[{"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/posts\/3614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/users\/1152"}],"replies":[{"embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/comments?post=3614"}],"version-history":[{"count":0,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/posts\/3614\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/media\/33313"}],"wp:attachment":[{"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/media?parent=3614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/categories?post=3614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/tags?post=3614"},{"taxonomy":"new_categories","embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/new_categories?post=3614"},{"taxonomy":"new_tags","embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/new_tags?post=3614"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.editage.com\/insights\/wp-json\/wp\/v2\/series?post=3614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}