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The measurements of time-integrated and time-resolved PL spectra were performed in the temperature range of 8 - 300 K under various excitation densities by using the fourth harmonies (4.66 eV) of a Nd:YAG laser. Exciton-related emission bands were clearly observed in the ZnO crystals having different morphologies. In nanoplatelets, an emission band originating from radiative recombination of donor-acceptor pairs was a] so found at around 3.17 eV, indicating the existence of acceptor centers. The binding energies of donor and acceptor were about 53 and 200meV, respectively. In nanowires, the intensity of an emission band peaking at 3.32eV obeyed a quadratic dependency on the density of excitation. This fact shows that an inelastic exciton-exciton scattering process is efficient in the nanowires because of high crystal quality."}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Htay,  MT"}], "nameIdentifiers": [{"nameIdentifier": "38770", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Itoh,  M"}], "nameIdentifiers": [{"nameIdentifier": "38771", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Hashimoto,  Y"}], "nameIdentifiers": [{"nameIdentifier": "38772", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ito,  K"}], "nameIdentifiers": [{"nameIdentifier": "38773", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2015-09-28"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "zz07032[1].pdf", "filesize": [{"value": "6.3 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 6300000.0, "url": {"label": "zz07032[1].pdf", "url": "https://soar-ir.repo.nii.ac.jp/record/12653/files/zz07032[1].pdf"}, "version_id": "bfac463c-b08c-4992-9535-79b8e0b9f05c"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Photoluminescence properties and morphologies of submicron-sized ZnO crystals prepared by ultrasonic spray pyrolysis", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Photoluminescence properties and morphologies of submicron-sized ZnO crystals prepared by ultrasonic spray pyrolysis"}]}, "item_type_id": "6", "owner": "1", "path": ["1221/1222"], "permalink_uri": "http://hdl.handle.net/10091/1156", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_value": "2008-09-17"}, "publish_date": "2008-09-17", "publish_status": "0", "recid": "12653", "relation": {}, "relation_version_is_last": true, "title": ["Photoluminescence properties and morphologies of submicron-sized ZnO crystals prepared by ultrasonic spray pyrolysis"], "weko_shared_id": null}