| 查看: 865 | 回复: 2 | |||
[交流]
帮忙修改语法错误-6（修改请标出）-
|
| Fig. 5 presents the room temperature photoluminescence spectra for both of the as-grown and the annealed wafer with excitation at 282 nm. A strong blue emission band centered at 435 nm can be observed for the two wafers. In the previous works, two peaks located at 420 and 485 nm were observed in the crystal fibers grown by laser-heated pedestal growth method [17], but it is a pity that they were not be explained. In the polycrystalline samples, an emission peak centered at 450 nm was reported, which agrees with our results [6, 24-27]. According to these literatures, the corner-shared XXX groups are efficient luminescent centers for the blue emission, which may be ascribed to self-trapped exciton recombination. This luminescence effect depends on the XXX bonding, because the conduction band is composed of XX orbitals and the valence band is composed of XX orbitals between the corner-sharing XXX octahedral. In other words, this luminescence was originated from the absorbing groups of the niobate octahedral group [XX]7-. So the luminescence intensity was also influenced by the oxygen vacancies in the XXX octahedral, which should be similar as the broadening of the Raman band at 905 cm-1 (Fig. 3). Having been annealed in the oxygen atmosphere, the oxygen vacancies in the crystal were eliminated. So the oxidation state of Nb ions was in the same XXX and the Nb and Mg sublattices were of higher degree of order, which results in a more perfect structure of XXX octahedral. Therefore, the annealed wafer exhibits greater intensity than the as-grown sample, as shown in Fig.5. The improvement in photoluminescence performance results from the improved crystallinity leading to higher oscillating strengths because the oxygen vacancies were eliminated [28]. |
回复此楼» 猜你喜欢
咱们一起用铁证分析2026国家社科基金中标与否
已经有27人回复
-
为什么余额宝的年化利率越来越低？主要原因有哪些？
已经有3人回复
-
2027广东省杰青
已经有9人回复
-
朋友圈看到的
已经有5人回复
-
欢迎发来filecode的Mz6后的代码验证其规律
已经有110人回复
-
明天放榜？
已经有5人回复
-
时间戳变了，能看出什么问题？
已经有11人回复
-
重要消息，中午系统在维护
已经有10人回复
-
投稿咨询
已经有6人回复
-
时间戳又变了8-15
已经有26人回复
» 抢金币啦！回帖就可以得到:
-
五大联赛看好哪支球队
+5/450
-
2026年财务管理、经济与信息技术国际会议 (FMEIT 2026)
+1/418
-
一点琐碎的家务事，却非常困扰我，让我内耗
+2/146
-
坐标北京诚征男友
+1/93
-
山东征女友，坐标济南
+1/91
-
上海交通大学张航课题组招聘博士后（电化学能量存储与转换）
+1/35
-
清华大学环境课题组招聘环境工作专业客座生研究生2-3名（应用导向）
+1/4
-
科研人员申请国际专利，到底该怎么走？（PCT vs 巴黎公约，一文讲透）
+1/4
-
中国科学院生态环境研究中心环境工程相关方向招收保送硕士和联合培养博士和硕士研究生
+1/4
-
河海大学海洋环境污染与生态毒理学研究组招收2027级硕士生 及博士研究生
+1/3
-
北京理工大学-集成电路与电子学院杰青团队-招博士后
+1/3
-
南京医科大学-冯璋课题组-招收2027级生化与分子生物学专业博士和硕士研究生
+1/3
-
2026年生物学、大数据与信息工程国际会议 (BSBIE 2026)
+1/3
-
27推免-广州医科大学封红亮教授招收精神医学应用心理学推免生
+1/3
-
北理工集成电路杰青团队 | 诚招科助理
+1/2
-
北理工集成电路杰青团队 | 诚招科助理
+1/2
-
埃克塞特大学商学院管理科学/运筹/数据科学方向Dr Fanlin Meng课题组招收2027秋博士
+1/2
-
中国科学院生物物理研究所田勇课题组招聘联合培养生
+1/2
-
趋化因子多重检测技术：免疫细胞迁移与微环境调控研究的核心工具
+1/1
-
【产品测评分享】体外转录产量不理想、dsRNA 副产物高？T7 RNA 聚合酶实测体验
+1/1
2楼2011-02-26 23:10:08
3楼2011-02-26 23:18:15
