{"created":"2025-02-18T10:14:40.594929+00:00","id":2005566,"links":{},"metadata":{"_buckets":{"deposit":"4ac5423d-fbe4-4b7e-9735-c2a9c1c21641"},"_deposit":{"created_by":41,"id":"2005566","owners":[41],"pid":{"revision_id":0,"type":"depid","value":"2005566"},"status":"published"},"_oai":{"id":"oai:hiroshima.repo.nii.ac.jp:02005566","sets":["1730444908512:1730444916333"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_title":"Photoluminescence characterization and morphology control of inorganic phosphor particles","subitem_title_language":"en"},{"subitem_title":"無機蛍光体粒子のフォトルミネッセンス特性評価及び形態制御","subitem_title_language":"ja"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"南, 孝明","creatorNameLang":"ja"},{"creatorName":"Minami, Takaaki","creatorNameLang":"en"}],"familyNames":[{"familyName":"南","familyNameLang":"ja"},{"familyName":"Minami","familyNameLang":"en"}],"givenNames":[{"givenName":"孝明","givenNameLang":"ja"},{"givenName":"Takaaki","givenNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186499011":{"attribute_name":"Rights","attribute_value_mlt":[{"subitem_rights":"Copyright(c) by Author"}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_subject":"570","subitem_subject_scheme":"NDC"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"The objective of this thesis is to investigate the photoluminescence characterization and morphologic control of inorganic phosphor particles. Both solid/dense and porous particles of europium-doped yttrium oxide (Y_2O_3:Eu^<3+>), and newly synthesized carbon-based boron oxynitride (BCNO) phosphors were selected as model materials. The major conclusions of this thesis can be summarized as follows.    Chapter 1 discusses the background, previous research, methods used to investigate photoluminescence phenomena, current state of the field, and problems associated with inorganic phosphors.    Chapter 2 describes the relationship between photoluminescence and both the particle and crystallite size of Y2O3:Eu^<3+> fine particles. The crystallite and particle sizes played different roles in the control of the photoluminescence characteristics of the phosphors. The blue-shift of the charge transfer band in the excitation spectra was mostly due to the particle-size effect. In contrast, the decrease in the crystal symmetry ratio, which is the ratio of the C_2 to C_<3i> sub-lattice populations in the photoluminescence emission spectra, was primarily due to the effect of crystallite size.    Chapter 3 demonstrates the effect of porosity on the photoluminescence of Y2O3:Eu^<3+> fine particles. The porous particles exhibited greater red-emission rendering properties than that of non-porous particles, based on the CIE chromaticity diagram. The photoluminescence intensity and quantum efficiency exhibited by the porous particles are greater than that of non-porous particles because the porous particles are hollow. Porous particles have unique photophysical properties, such as a 4-nm blue-shift in the charge-transfer and a lower symmetry ratio of 2.7, which were not exhibited byIIthe non-porous particles with a particle size of 757 nm and a crystallite size of approximately 30 nm. The properties of sub-micrometer porous particles were identical to those of non-porous particles, which have reduced particle and crystallite size compared with porous particles.    Chapter 4 presents a detailed chemical analysis and photoluminescence characterization of the BCNO phosphors. The resulting powder has high external quantum efficiency with a direct band-gap transition. The BCNO phosphors have these properties because the atomic distances of the BCNO are less than those of conventional BCN compounds, which have an indirect band-gap transition and low quantum efficiency. The smaller atomic distances of the BCNO result from the presence of oxygen atoms, which have higher electron affinity and smaller covalent-bond radii compared with boron, carbon and nitrogen.    A simple summary and comments regarding future investigations are provided in Chapter 5.","subitem_description_language":"en"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_1617187087799":{"attribute_name":"Dissertation Number","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第4905号"}]},"item_1617187112279":{"attribute_name":"Degree Name","attribute_value_mlt":[{"subitem_degreename":"博士(工学)","subitem_degreename_language":"ja"},{"subitem_degreename":"Engineering","subitem_degreename_language":"en"}]},"item_1617187136212":{"attribute_name":"Date Granted","attribute_value_mlt":[{"subitem_dategranted":"2009-03-23"}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_1617353299429":{"attribute_name":"Relation","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"Chapter 1, T. Minami and S. Hirayama : High quality fluorescence decay curves and lifetime imaging using an elliptical scan streak camera, J. Photochem. Photobio A: Chemistry, 53 (1990), pp. 11-21"}],"subitem_relation_type":"references"},{"subitem_relation_name":[{"subitem_relation_name_text":"Chapter 2, T.Minami, W-N Wang, F. Iskandar, and K. Okuyama : Photoluminescence properties of submicrometer phosphors with different crystallite/particle sizes, Jpn. J. Appl. Phys, 47 (2008), pp. 7220-7223"}],"subitem_relation_type":"references"},{"subitem_relation_name":[{"subitem_relation_name_text":"Chapter 3, Widiyastuti, W., T. Minami, W-N. Wang, F. Iskandar, and K. Okuyama : Photoluminescence Characteristics of Macroporous Eu-Doped Yttrium Oxide Particles Prepared by Spray Pyrolysis, Jpn. J. Appl. PhysJpn. J. Appl. Phys. 48 (2009) 032001"}],"subitem_relation_type":"references"},{"subitem_relation_name":[{"subitem_relation_name_text":"Chapter 4, T.Minami, W-N. Wang, Y. Kaihatsu, F. Iskandar, and K. Okuyama : Photoluminescence and Electron Energy Loss Specta Analysis of New Carbon-based Boron Oxynitride Phosphor Particles, J. Mater. Sci. in review"}],"subitem_relation_type":"references"},{"subitem_relation_type":"references","subitem_relation_type_id":{"subitem_relation_type_id_text":"http://dx.doi.org/10.1016/1010-6030(90)87108-N","subitem_relation_type_select":"DOI"}},{"subitem_relation_type":"references","subitem_relation_type_id":{"subitem_relation_type_id_text":"http://dx.doi.org/10.1143/JJAP.47.7220","subitem_relation_type_select":"DOI"}},{"subitem_relation_type":"references","subitem_relation_type_id":{"subitem_relation_type_id_text":"http://dx.doi.org/10.1143/JJAP.48.032001","subitem_relation_type_select":"DOI"}}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2023-03-18"}],"displaytype":"simple","filename":"diss_ko4905.pdf","filesize":[{"value":"3.7 MB"}],"mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://hiroshima.repo.nii.ac.jp/record/2005566/files/diss_ko4905.pdf"},"version_id":"c3ed8348-0ccd-4d90-9ca9-36376045fa87"}]},"item_1617944105607":{"attribute_name":"Degree Grantor","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"広島大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"15401","subitem_degreegrantor_identifier_scheme":"kakenhi"}]},{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"Hiroshima University"}]}]},"item_1732771732025":{"attribute_name":"旧ID","attribute_value":"30346"},"item_title":"Photoluminescence characterization and morphology control of inorganic phosphor particles","item_type_id":"40003","owner":"41","path":["1730444916333"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-03-18"},"publish_date":"2023-03-18","publish_status":"0","recid":"2005566","relation_version_is_last":true,"title":["Photoluminescence characterization and morphology control of inorganic phosphor particles"],"weko_creator_id":"41","weko_shared_id":-1},"updated":"2025-02-20T08:53:00.925730+00:00"}