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Ba2SiO4荧光粉中Ce3+和Eu2+的光谱性质和能量传递 总被引:5,自引:4,他引:1
采用高温固相法合成了绿色荧光粉Ba2SiO4:Ce3 ,Eu2 .测量了它们的吸收光谱、激发光谱和发射光谱,观察到了Ba2SiO4中Ce3 对Eu2 发光的敏化现象,发光的敏化作用缘于Ce3 和Eu2 之间的高效无辐射能量传递. 相似文献
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Improved performance of P3HT:PCBM solar cells by both anode modification and short-wavelength energy utilization using Tb(aca)3phen 下载免费PDF全文
The performance of P3HT:PCBM solar cells was improved by anode modification using spin-coated Tb(aca)3phen ultrathin films. The modification of the Tb(aca)3phen ultrathin film between the indium tin oxide(ITO) anode and the PEDOT:PSS layer resulted in a maximum power conversion efficiency(PCE) of 2.99% compared to 2.66% for the reference device, which was due to the increase in the short-circuit current density(Jsc). The PCE improvement could be attributed to the short-wavelength energy utilization and the optimized morphology of the active layers. Tb(aca)3phen with its strong down-conversion luminescence properties is suitable for the P3HT:PCBM blend active layer, and the absorption region of the ternary blend films is extended into the near ultraviolet region. Furthermore, the crystallization and the surface morphology of P3HT:PCBM films were improved with the Tb(aca)3phen ultrathin film. The ultraviolent–visible absorption spectra,atomic force microscope(AFM), and X-ray diffraction(XRD) of the films were investigated. Both anode modification and short-wavelength energy utilization using Tb(aca)3phen in P3HT:PCBM solar cells led to about a 12% PCE increase. 相似文献
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采用化学氧化法制备聚苯胺与还原石墨烯复合材料。复合材料的结构、晶型和电磁参数分别通过X射线衍射仪及HP8722ES型矢量网络分析仪进行表征、测试与分析。结果表明,同聚苯胺相比,聚苯胺与还原石墨烯复合材料的介电损耗明显增加。而且在复合材料中,石墨烯的含量越大,材料的微波吸收性能越好,在频率波段(9.5~13.4GHz)反射损耗均小于-10 dB,并在频率为11.2 GHz时达到最大反射损耗-29.69 dB。聚苯胺与还原石墨烯的复合使得材料的载流子迁移率变大,吸波特性得到改善。 相似文献
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铝酸盐绿色荧光粉制备工艺与发光性能关系的研究 总被引:5,自引:1,他引:5
采用高温固相法制备了CeMgAl11O19:Tb (CMAT)荧光粉, 系统研究了该荧光粉的制备工艺与发光性能的关系, 并对不同结果进行了分析. 研究表明, 铝含量适当过量有利于荧光粉发光亮度的提高; 在1400~1550 ℃的范围内, CMAT的发光亮度呈稳定的上升趋势, 这表明在一定的范围内, 温度越高越有利于材料的结晶; MgF2可以取代目前工业生产中普遍采用的传统助熔剂H3BO3, 起到很好的激活晶格形成, 促进晶粒生长的效果. 相似文献
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正2019年9月20-23日,由中国物理学会发光分会主办、北京交通大学等承办的第十一届全国有机发光和光电性质学术会议在北京四川五粮液龙爪树宾馆举行。在2019年9月21日的会议开幕式上,大会主席、《发光与光信息技术教育部重点实验室》主任王永生教授致欢迎词;参加本届会议的有中国科学院院士刘云圻、李述汤、李永舫3人,及国内在该领域的教授、专家和学生共688人。其中国内相关的重要团队都参加了本次会议,如清华大学、北京大学、南京大 相似文献
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We synthesize Au@SiO2composite particles with a core-shell structure, and utilize the Au@SiO2nanoparticles to modulate the fluorescence emission of the graphene quantum dot(GQD) through varying the silica shell thickness. The silica shell thickness can be easily controlled by varying the coating time. After silica coating, we investigate the influence of the silica thickness on the fluorescence emission of the GQD and find that the fluorescence property of the GQD can be changed as expected by varying the thickness of the silica shell. We propose an optimized coating time for the silica shell under the interaction of fluorescence quenching and enhancement. 相似文献
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合成了系列2(Ba1-xSrxO) (1-y)P2O5·yB2O3∶Eu2+样品,研究了样品在长波紫外区域的激发光谱和发射光谱.从激发谱可以看出2(BaO)(1-y)P2O5·yB2O3∶Eu2+在300~380 nm附近区域有很强的吸收带,在380 nm 紫外光激发下,2(BaO)·(1-y)P2O5·yB2O3∶Eu2+的发射带位于400~430 nm;在2(Ba1-xSrxO)-(1-y)P2O5·yB2O3∶Eu2+的系列样品中,当x>0.2时,随着x的增大,基质晶格在330~380 nm吸收带整体向低能方向移动了40 nm;在147 nm 激发下的发射谱是主峰值位于478 nm的蓝绿光发射. 相似文献