Exploration of New Phosphors Using a Mineral-Inspired Approach in Combination with Solution Parallel Synthesis
We introduce the concept, as well as the methodology, of using a mineral-inspired approach in combination with solution parallel synthesis for the exploration of new phosphors. The key to successful discovery of new phosphors is the construction of a prom
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Exploration of New Phosphors Using a Mineral-Inspired Approach in Combination with Solution Parallel Synthesis Masato Kakihana, Hideki Kato, Makoto Kobayashi, Yasushi Sato, Koji Tomita and Tetsufumi Komukai
Abstract We introduce the concept, as well as the methodology, of using a mineral-inspired approach in combination with solution parallel synthesis for the exploration of new phosphors. The key to successful discovery of new phosphors is the construction of a promising composition library. In this chapter, the construction of an artificial composition library inspired by minerals is proposed. By employing this approach, we have discovered various new phosphors including NaAlSiO4:Eu2+, BaZrSi3O9:Eu2+, Na3ScSi3O9:Eu2+, SrCaSiO4:Eu2+, and Ca2SiO4: Eu2+ that emit green-yellow (553 nm), cyan blue-green (480 nm), green (520 nm), orange-red (615 nm), and deep-red (650 nm) light, respectively, when excited at 365–460 nm. Among these phosphors, the most prominent result was the observation of unusual deep-red emission from Ca2SiO4:Eu2+, which originated from the phase transition from the normal b-phase to an a0 l-phase when a sizable number of Ca2+ sites were substituted by Eu2+ (up to 40 mol%). The reason for the emergence of the deep-red emission of a0 l-Ca2SiO4:Eu2+ is discussed in terms of “crystal site
M. Kakihana (&) H. Kato M. Kobayashi Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan e-mail: [email protected] Y. Sato Department of Chemistry, Faculty of Science, Okayama University of Science, Okayama 700-0005, Japan K. Tomita Department of Chemistry, School of Science, Tokai University, Hiratsuka 259-1292, Japan T. Komukai Ichikawa Research Center, Sumitomo Metal Mining Co., Ltd., Ichikawa, Japan © Springer Science+Business Media Singapore 2016 R.S. Liu (ed.), Phosphors, Up Conversion Nano Particles, Quantum Dots and Their Applications, DOI 10.1007/978-981-10-1590-8_1
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engineering.” In addition to these silicate-based phosphors, exploration of new oxide up-conversion phosphors was carried out using solution parallel synthesis. Among various niobates and tantalates of rare earth elements, Y0.5Yb0.4Er0.1Ta7O19 was discovered as a new oxide up-conversion phosphor with a good internal quantum efficiency (2.05 %) compared with those of previously known up-conversion phosphors, which are typically below 1 %.
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Introduction
One of the characteristic features of inorganic materials is that they include almost all the elements in the periodic table. In other words, the types of existing inorganic substances are enormous, and countless unknown new inorganic substances may also exist. We will focus on silicon, which has the second highest Clarke number and is the second most abundant element on Earth after oxygen. According to the database of inorganic compounds (https://icsd.fiz-karlsruhe.de/), among the inorganic materials that include silicon, as of September 2014, there are 21,386 types of inorganic substances with known
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