The temperature dependence of the photoluminescence（PL） from Mn S/Zn S core–shell quantum dots is investigated in a temperature range of 8 K–300 K. The orange emission from the ^4T1→^6A1transition of Mn^2＋ions a...The temperature dependence of the photoluminescence（PL） from Mn S/Zn S core–shell quantum dots is investigated in a temperature range of 8 K–300 K. The orange emission from the ^4T1→^6A1transition of Mn^2＋ions and the blue emission related to the trapped surface state are observed in the Mn S/Zn S core–shell quantum dots. As the temperature increases, the orange emission is shifted toward a shorter wavelength while the blue emission is shifted towards the longer wavelength. Both the orange and blue emissions reduce their intensities with the increase of temperature but the blue emission is quenched faster. The temperature-dependent luminescence intensities of the two emissions are well explained by the thermal quenching theory.展开更多
制备了Mn掺杂Zn-In-S量子点并研究了Zn/In的量比和反应温度对其发光性质的影响。在Mn掺杂的Zn-In-S量子点的发光谱中观测到一个600 nm发光带。通过改变Zn/In的量比,掺杂量子点的吸收带隙可从3.76 e V(330 nm)调谐到2.82 e V(440 nm),但6...制备了Mn掺杂Zn-In-S量子点并研究了Zn/In的量比和反应温度对其发光性质的影响。在Mn掺杂的Zn-In-S量子点的发光谱中观测到一个600 nm发光带。通过改变Zn/In的量比,掺杂量子点的吸收带隙可从3.76 e V(330 nm)调谐到2.82 e V(440 nm),但600 nm发光峰的波长只有略微移动。这些掺杂量子点的最长荧光寿命为2.14 ms。当反应温度从200℃增加到230℃时,掺杂量子点的发光强度增加并达到最大值;而继续升高温度至260℃时,发光强度迅速减弱。此外,测量了Mn掺杂Zn-In-S量子点的变温发光光谱。发现随着温度的升高,发光峰位发生蓝移,发光强度明显下降。分析认为,Mn掺杂Zn-In-S量子点的600 nm发光来自于Mn2+离子的4T1和6A1之间的辐射复合。展开更多
本文采用Mn^2＋掺杂和组装壳等技术,以变性牛血清白蛋白（d BSA）为稳定剂,探索水相合成新型掺杂-核壳结构Ag In S2：Mn@Zn S量子点的方法。工作中以产物的荧光和磷光强度为指标,通过考察Mn^2＋和Zn的用量、反应的气氛、p H值、温度和...本文采用Mn^2＋掺杂和组装壳等技术,以变性牛血清白蛋白（d BSA）为稳定剂,探索水相合成新型掺杂-核壳结构Ag In S2：Mn@Zn S量子点的方法。工作中以产物的荧光和磷光强度为指标,通过考察Mn^2＋和Zn的用量、反应的气氛、p H值、温度和时间来优化Ag In S2：Mn@Zn S量子点的合成条件。用扫描隧道显微镜、X射线粉末衍射等技术对量子点的形貌、结构进行了表征。结果表明,该量子点的直径为9^11nm,量子产率为43.2%。用荧光光谱等方法研究了其光致发光性能,并应用于对胰蛋白酶的选择性识别。展开更多
Cu2S film onto FTO glass substrate was obtained to function as counter electrode for polysulfide redox reactions in CdS/CdSe co-sensitized solar cells by sintering after spraying a metal chalcogenide complex, N4H9Cu7S...Cu2S film onto FTO glass substrate was obtained to function as counter electrode for polysulfide redox reactions in CdS/CdSe co-sensitized solar cells by sintering after spraying a metal chalcogenide complex, N4H9Cu7S4 solution. Relative to Pt counter electrode, the Cu2S counter electrode provides greater electrocatalytic activity and lower charge transfer resistance. The pre- pared CuzS counter electrode represented nanoflower-like porous film which was composed of Cu2S nanosheets on FTO and had a higher surface area and lower sheet resistance than that of sulfided brass Cu2S counter electrode. An energy conversion efficiency of 3.62% was achieved using the metal chalcogenide complex-mediated fabricated Cu2S counter electrode for CdS/CdSe co-sensitized solar cells under 1 sun, AM 1.5 illumination.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11304300,21002097,11074232,and 11274288)the National Basic Research Program of China(Grant Nos.2011CB932801 and 2012CB933702)+2 种基金the Fund from the Ministry of Education of China(Grant No.20123402110034)the Fundamental Research Funds for the Central Universities(Grant No.WK2030420002)the Anhui Provincial Natural Science Foundation,China(Grant No.1308085QA06)
文摘The temperature dependence of the photoluminescence（PL） from Mn S/Zn S core–shell quantum dots is investigated in a temperature range of 8 K–300 K. The orange emission from the ^4T1→^6A1transition of Mn^2＋ions and the blue emission related to the trapped surface state are observed in the Mn S/Zn S core–shell quantum dots. As the temperature increases, the orange emission is shifted toward a shorter wavelength while the blue emission is shifted towards the longer wavelength. Both the orange and blue emissions reduce their intensities with the increase of temperature but the blue emission is quenched faster. The temperature-dependent luminescence intensities of the two emissions are well explained by the thermal quenching theory.
文摘本文采用Mn^2＋掺杂和组装壳等技术,以变性牛血清白蛋白（d BSA）为稳定剂,探索水相合成新型掺杂-核壳结构Ag In S2：Mn@Zn S量子点的方法。工作中以产物的荧光和磷光强度为指标,通过考察Mn^2＋和Zn的用量、反应的气氛、p H值、温度和时间来优化Ag In S2：Mn@Zn S量子点的合成条件。用扫描隧道显微镜、X射线粉末衍射等技术对量子点的形貌、结构进行了表征。结果表明,该量子点的直径为9^11nm,量子产率为43.2%。用荧光光谱等方法研究了其光致发光性能,并应用于对胰蛋白酶的选择性识别。
基金supported by the National Basic Research Program of China(2011CBA00700)the National High Technology Research and Development Program of China (2011AA050527)+1 种基金the External Cooperation Program ofthe Chinese Academy of Sciences (GJHZ1220)the National Natural Science Foundation of China (21003130, 21173228)
文摘Cu2S film onto FTO glass substrate was obtained to function as counter electrode for polysulfide redox reactions in CdS/CdSe co-sensitized solar cells by sintering after spraying a metal chalcogenide complex, N4H9Cu7S4 solution. Relative to Pt counter electrode, the Cu2S counter electrode provides greater electrocatalytic activity and lower charge transfer resistance. The pre- pared CuzS counter electrode represented nanoflower-like porous film which was composed of Cu2S nanosheets on FTO and had a higher surface area and lower sheet resistance than that of sulfided brass Cu2S counter electrode. An energy conversion efficiency of 3.62% was achieved using the metal chalcogenide complex-mediated fabricated Cu2S counter electrode for CdS/CdSe co-sensitized solar cells under 1 sun, AM 1.5 illumination.
