A three-layered phosphor structure was designed and prepared by the spin coating of BaSi_(2)N_(2)O_(2):Eu(cyan-emitting)and(Sr,Ca)AlSiN_(3):Eu(red-emitting)phosphor films on the yellowemitting Y_(3)Al_(5)O_(12):Ce(YAG...A three-layered phosphor structure was designed and prepared by the spin coating of BaSi_(2)N_(2)O_(2):Eu(cyan-emitting)and(Sr,Ca)AlSiN_(3):Eu(red-emitting)phosphor films on the yellowemitting Y_(3)Al_(5)O_(12):Ce(YAG:Ce)phosphor ceramic synthesized by the solid-state reaction under vacuum sintering.In order to achieve high color rendering lighting,the influence of the composition and structure of the three-layered phosphors on the optical,thermal,and electrical properties of the chip-on-board(COB)packaged white-light-emitting diodes(WLEDs)was studied systematically.The WLED with the structure of“red+cyan+yellow”(R+C+Y)three-layered phosphor generated neutral white light and had a luminous efficacy of 75 lm/W,the fidelity index(R_(f))of 93,the gamut index(R_(g))of 97,and the correlated color temperature(CCT)of 3852 K.Under the excitation of laser diode(LD),the layer-structured phosphor yielded the white light with a luminous efficacy of 120 lm/W,color rendering index(CRI)of 90,and CCT of 5988 K.The result indicates that the three-layered phosphor structure is a promising candidate to achieve high color rendering and high luminous efficacy lighting.展开更多
信息化平台建设是实验教学中心提高管理水平、实现优质教学资源共享、更好地发挥示范辐射作用、确保开放运行质量的必要保证,在实验中心的建设过程中具有重要作用。为进一步提高信息化管理水平,西南交通大学国家级机械基础实验中心在原...信息化平台建设是实验教学中心提高管理水平、实现优质教学资源共享、更好地发挥示范辐射作用、确保开放运行质量的必要保证,在实验中心的建设过程中具有重要作用。为进一步提高信息化管理水平,西南交通大学国家级机械基础实验中心在原有网络化管理系统的基础上,采用ASP.NET 3.5与SQL SERVER 2008相结合,重新开发建设了信息化管理平台。系统架构由客户端层、应用逻辑层、数据库层3个层次组成,具有易扩展、易维护、开放化、智能化和安全可靠等特点。展开更多
基金supported by the National Key R&D Program of China(Grant No.2017YFB0310500)the National Natural Science Foundation of China(Grant No.61775226)+1 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDA22010301)the key research project of the frontier science of the Chinese Academy of Sciences(No.QYZDB-SSW-JSC022).
文摘A three-layered phosphor structure was designed and prepared by the spin coating of BaSi_(2)N_(2)O_(2):Eu(cyan-emitting)and(Sr,Ca)AlSiN_(3):Eu(red-emitting)phosphor films on the yellowemitting Y_(3)Al_(5)O_(12):Ce(YAG:Ce)phosphor ceramic synthesized by the solid-state reaction under vacuum sintering.In order to achieve high color rendering lighting,the influence of the composition and structure of the three-layered phosphors on the optical,thermal,and electrical properties of the chip-on-board(COB)packaged white-light-emitting diodes(WLEDs)was studied systematically.The WLED with the structure of“red+cyan+yellow”(R+C+Y)three-layered phosphor generated neutral white light and had a luminous efficacy of 75 lm/W,the fidelity index(R_(f))of 93,the gamut index(R_(g))of 97,and the correlated color temperature(CCT)of 3852 K.Under the excitation of laser diode(LD),the layer-structured phosphor yielded the white light with a luminous efficacy of 120 lm/W,color rendering index(CRI)of 90,and CCT of 5988 K.The result indicates that the three-layered phosphor structure is a promising candidate to achieve high color rendering and high luminous efficacy lighting.
文摘信息化平台建设是实验教学中心提高管理水平、实现优质教学资源共享、更好地发挥示范辐射作用、确保开放运行质量的必要保证,在实验中心的建设过程中具有重要作用。为进一步提高信息化管理水平,西南交通大学国家级机械基础实验中心在原有网络化管理系统的基础上,采用ASP.NET 3.5与SQL SERVER 2008相结合,重新开发建设了信息化管理平台。系统架构由客户端层、应用逻辑层、数据库层3个层次组成,具有易扩展、易维护、开放化、智能化和安全可靠等特点。
