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      Long-lasting ultraviolet-A persistent luminescence and photostimulated persistent luminescence in Bi 3+-doped LiScGeO 4phosphor

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          Abstract

          A UVA emissive LiScGeO 4:Bi 3+persistent phosphor is developed, which exhibits single-band, long-lasting persistent luminescence and a photostimulated persistent luminescence capability.

          Abstract

          Persistent phosphors emitting in the ultraviolet (UV) spectral region have attracted great attention in recent years, owing to their promising potential in many advanced applications ranging from photocatalysis to phototherapy. Here, we report the development of a novel UVA emissive persistent phosphor by doping Bi 3+into a LiScGeO 4host. The LiScGeO 4:Bi 3+persistent phosphor can be effectively charged using a standard 254 nm UV lamp and emits intense, long-lasting persistent luminescence peaking at 365 nm for longer than 120 h. Besides, the UVA persistent luminescence from the pre-irradiated LiScGeO 4:Bi 3+phosphor can be repeatedly rejuvenated by short-time photostimulation with low-energy white, red and near-infrared (NIR) light. The long-lasting UVA afterglow, together with the photostimulated persistent luminescence (PSPL) capability, makes the LiScGeO 4:Bi 3+phosphor an important element of persistent luminescence materials in the UVA spectral region. This UVA persistent phosphor is expected to find exciting applications in the fields of medical therapy and environmental research.

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          Enhanced photocatalytic performance of direct Z-scheme g-C3N4-TiO2 photocatalysts for the decomposition of formaldehyde in air.

          Jiaguo Yu, Shuhan Wang, Jingxiang Low … (2013)
          Formaldehyde (HCHO) is a major indoor pollutant and long-term exposure to HCHO may cause health problems such as nasal tumors and skin irritation. Photocatalytic oxidation is considered as the most promising strategy for the decomposition of HCHO. Herein, for the first time, a direct g-C3N4-TiO2 Z-scheme photocatalyst without an electron mediator was prepared by a facile calcination route utilizing affordable P25 and urea as the feedstocks. Photocatalytic activities of the as-prepared samples were evaluated by the photocatalytic oxidation decomposition of HCHO in air. It was shown that the photocatalytic activity of the prepared Z-scheme photocatalysts was highly dependent on the g-C3N4 content. At the optimal g-C3N4 content (sample U100 in this study), the apparent reaction rate constant was 7.36 × 10(-2) min(-1) for HCHO decomposition, which exceeded that of pure P25 (3.53 × 10(-2) min(-1)) by a factor of 2.1. The enhanced photocatalytic activity could be ascribed to the formation of a g-C3N4-TiO2 Z-scheme photocatalyst, which results in the efficient space separation of photo-induced charge carriers. Considering the ease of the preparation method, this work will provide new insights into the design of high-performance Z-scheme photocatalysts for indoor air purification.
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            A New Long Phosphorescent Phosphor with High Brightness, SrAl[sub 2]O[sub 4]:Eu[sup 2+],Dy[sup 3+]

            T Matsuzawa (1996)
            Article 0 comments Cited 231 times – based on 0 reviews     Review now
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              Long persistent phosphors--from fundamentals to applications.

              Yang Li, Jianrong Qiu, Mindaugas Gecevicius (2016)
              Owing to the unique mechanism of photoelectron storage and release, long persistent phosphorescence, also called long persistent luminescence or long lasting afterglow/phosphorescence, plays a pivotal role in the areas of spectroscopy, photochemistry, photonics and materials science. In recent years, more research has focused on the manipulation of the morphology, operational wavebands and persistent duration of long persistent phosphors (LPPs). These desired achievements stimulated the growing interest in designing bio-labels, photocatalysts, optical sensors, detectors and photonic devices. In this review, we present multidisciplinary research on synthetic methods, afterglow mechanisms, characterization techniques, materials system, and applications of LPPs. First, we introduce the recent developments in LPPs for the synthesis of nanoparticles from the aspects of particle sizes, monodispersity and homogeneity based on the urgent application of bio-imaging. In the later sections, we present the possible mechanisms, which involve the variation of trap distribution during the trapping and de-trapping process, complicated photo-ionization reaction of trap site levels and impurity centers together with their corresponding migration kinetics of carriers. Meanwhile, we emphasize the characterization techniques of defects, used to qualitatively or quantitatively describe the types, concentrations and depths of the traps. This review article also highlights the recent advances in suggested LPPs materials with a focus on the LPPs' hosts and optically active centers as well as their control, tuning and intrinsic links. We further discuss the classification of LPPs based on the different emission and excitation wavebands from the ultraviolet to the near-infrared region along with an overview of the activation mode of afterglow. Afterwards, we provide an exhibition of new products towards diverse application fields, including solar energy utilization, bio-imaging, diagnosis, and photocatalysts. Finally, we summarize the current achievements, discuss the problems and provide suggestions for potential future directions in the aforementioned parts.
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                Author and article information

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                Journal
                Journal ID (publisher-id): ICFNAW
                Title: Inorganic Chemistry Frontiers
                Abbreviated Title: Inorg. Chem. Front.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Electronic): 2052-1553
                Publication date Created: August 25 2020
                Publication date (Electronic): 2020
                Volume: 7
                Issue: 17
                Pages: 3063-3071
                Affiliations
                [1 ]School of Materials Science & Engineering
                [2 ]Shandong University
                [3 ]Jinan 250061
                [4 ]China
                [5 ]Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials
                Article
                DOI: 10.1039/D0QI00578A
                SO-VID: cb78b030-df57-44cc-8c74-1e5f6dc19b70
                Copyright © © 2020
                License:

                http://rsc.li/journals-terms-of-use

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