Tb3＋-doped Ca2BO3C1 compounds with different charge compensation approaches are synthesized by a hightemperature solid-state reaction method, and the luminescent properties and Commission Internationale de l＇Eclaira...Tb3＋-doped Ca2BO3C1 compounds with different charge compensation approaches are synthesized by a hightemperature solid-state reaction method, and the luminescent properties and Commission Internationale de l＇Eclairage （CIE） chromaticity coordinates are systematically characterized. Ca2BO3Cl：Tb3＋ can produce green emission under 376 nm radiation excitation. With codoped A＋ （A = Li, Na, K） as charge compensators, the relative emission intensities of Ca2BO3Cl：Tb3＋ are enhanced by about 1.61, 1.97, and 1.81 times compared with those of the direct charge balance, which is considered to be due to the effect of the difference in ion radius on the crystal field. The CIE chromaticity coordinates of Ca2BO3CI：Tb3＋, A＋ （A = Li, Na, K） are （0.335, 0.584）, （0.335, 0.585）, and （0.335, 0.585）, corresponding to the hues of green. Therefore, A＋ （A = Li, Na, K） may be the optimal charge compensator for Ca2BO3Cl：Tb3＋.展开更多
Li Bo,32,an attending physician at Xiyuan Hospital of the China Academy of Chinese Medical Sciences,spent a year and a half between 2008 and 2010 participating in a traditional Chinese medicine (TCM) project at the Mu...Li Bo,32,an attending physician at Xiyuan Hospital of the China Academy of Chinese Medical Sciences,spent a year and a half between 2008 and 2010 participating in a traditional Chinese medicine (TCM) project at the Muhimbili National Hospital in Dar Es Salaam,Tanzania.Now back in Beijing,he spoke to ChinAfrica展开更多
This is the 11th consecutive year that the No.1 document has focused on rural issues.The 10 previous documents are as follows:2013The No.1 Central Document issued on Jan.31,2013,put the theme on"speeding up the m...This is the 11th consecutive year that the No.1 document has focused on rural issues.The 10 previous documents are as follows:2013The No.1 Central Document issued on Jan.31,2013,put the theme on"speeding up the modernization of agriculture and further strengthening the vitality of rural growth."It listed ensuring grain security and supplies展开更多
基金supported by the National Basic Research Program of China(Grant No.2010CB327704)the National Natural Science Foundation of China(Grant No.51272022)+3 种基金the New Century Excellent Talents in University,China(Grant No.NCET-10-0220)the Research Fund for the Doctoral Program of Higher Education,China(Grant No.20120009130005)the Excellent Doctor's Science and Technology Innovation Foundation of Beijing Jiaotong University,China(Grant No.2011YJS073)the Fundamental Research Funds for the Central Universities(Grant No.2012JBZ001)
文摘Tb3＋-doped Ca2BO3C1 compounds with different charge compensation approaches are synthesized by a hightemperature solid-state reaction method, and the luminescent properties and Commission Internationale de l＇Eclairage （CIE） chromaticity coordinates are systematically characterized. Ca2BO3Cl：Tb3＋ can produce green emission under 376 nm radiation excitation. With codoped A＋ （A = Li, Na, K） as charge compensators, the relative emission intensities of Ca2BO3Cl：Tb3＋ are enhanced by about 1.61, 1.97, and 1.81 times compared with those of the direct charge balance, which is considered to be due to the effect of the difference in ion radius on the crystal field. The CIE chromaticity coordinates of Ca2BO3CI：Tb3＋, A＋ （A = Li, Na, K） are （0.335, 0.584）, （0.335, 0.585）, and （0.335, 0.585）, corresponding to the hues of green. Therefore, A＋ （A = Li, Na, K） may be the optimal charge compensator for Ca2BO3Cl：Tb3＋.
文摘Li Bo,32,an attending physician at Xiyuan Hospital of the China Academy of Chinese Medical Sciences,spent a year and a half between 2008 and 2010 participating in a traditional Chinese medicine (TCM) project at the Muhimbili National Hospital in Dar Es Salaam,Tanzania.Now back in Beijing,he spoke to ChinAfrica
文摘This is the 11th consecutive year that the No.1 document has focused on rural issues.The 10 previous documents are as follows:2013The No.1 Central Document issued on Jan.31,2013,put the theme on"speeding up the modernization of agriculture and further strengthening the vitality of rural growth."It listed ensuring grain security and supplies
