继承优良传统 开创美好未来

发光分会委员会名誉主任徐叙2院士的贺信:全国发光学学术会议组织委员会刘益春主任、发光学界的同志们、朋友们:感谢你们在关键的时刻,精心组织了这次将载入我国发光学史册的重要会议,热烈祝贺会议胜利召开。说它是关键时刻,是因为从本次会议起,绝大部分老同志都将退出发光学会的组织工作,发光界面临着“继承优良传统,开创美好未来”的局面。说它是关键时刻,是因为我们国家正处在向建设创新型社会转变的时期,需要发光界同仁淡泊名利,团结合作,解决现实难题,探索尖端科学。发光的本质是能量的转化,它在宇宙中每天都在发生,大部分又都会引起发…     

SrS∶Ce薄膜电致发光机制

在分析Ｃｅ３＋ 激发态能级与导带之间杂化相互作用的基础上， 讨论了电场强度与场致电离之间的关系。实验测得的ＳｒＳ∶Ｃｅ ＴＦＥＬ发光波形表明， 在正弦电压驱动下的半周期内， 一种样品在上升沿有发光， 而另一种样品在上升和下降沿有两个发光峰。这种不同的产生与样品中硫空位对ＳｒＳ∶Ｃｅ 激发和发射过程的影响有关。上升沿的发光主要是由直接碰撞激发引起的分立中心的发光， 而下降沿的发光及上升沿的部分发光属于因电离而引起的复合发光。     

高密度激发下CdS中束缚激子与激子的散射发光

本文在液氦温度下在CdS中观测到一个新的发光峰,并提出束缚激子与激子非弹性散射发光模型对该峰的产生和特性进行了解释。     

ZnS:Er~(3 )在960nm激光泵浦下的上转换发光

对Er~(3 )掺杂的ZnS在960nm激光泵浦下的上转换发光作了研究报道.结果表明ZnS:Er~(3 )在960nm激光的泵浦下具有较强的上转换发光.研究中,对Er~(3 )构成的聚集团(cluster)及Er~(3 )离子之间的相互作用对ZnS:Er~(3 )的上转换发光的影响作了讨论.     

高压条件下ZnS材料Mn中心与Tm中心的相互作用

系统地研究了ZnS材料在高压条件下Mn中心与Tm中心的相互作用,实验结果表明,这两种中心之间的能量传递几率随压力发生明显变化,较详细地讨论了产生这种变化的原因。     

Influence of small-molecule material on performance of polymer solar cells based on MEH-PPV:PCBM blend

In this work,the influence of a small-molecule material,tris(8-hydroxyquinoline) aluminum (Alq 3),on bulk het-erojunction (BHJ) polymer solar cells (PSCs) is investigated in devices based on the blend of poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) and [6,6]-phenyl-C 61-butyric acid methyl ester (PCBM).By dop-ing Alq 3 into MEH-PPV:PCBM solution,the number of MEH-PPV excitons can be effectively increased due to the energy transfer from Alq 3 to MEH-PPV,which probably induces the increase of photocurrent generated by excitons dissociation.However,the low carrier mobility of Alq 3 is detrimental to the efficient charge transport,thereby blocking the charge collection by the respective electrodes.The balance between photon absorption and charge transport in the active layer plays a key role in the performance of PSCs.For the case of 5 wt.% Alq 3 doping,the device performance is deteriorated rather than improved as compared with that of the undoped device.On the other hand,we adopt Alq 3 as a buffer layer instead of commonly used LiF.All the photovoltaic parameters are improved,yielding an 80% increase in power conversion efficiency (PCE) at the optimum thickness (1 nm) as compared with that of the device without any buffer layer.Even for the 5 wt.% Alq 3 doped device,the PCE has a slight enhancement compared with that of the standard device after modification with 1 nm (or 2 nm) thermally evaporated Alq 3.The performance deterioration of Alq 3-doped devices can be explained by the low solubility of Alq 3,which probably deteriorates the bicontinuous D-A network morphology;while the performance improvement of the devices with Alq 3 as a buffer layer is attributed to the increased light harvesting,as well as blocking the hole leakage from MEH-PPV to the aluminum (Al) electrode due to the lower highest occupied molecular orbital (HOMO) level of Alq 3 compared with that of MEH-PPV.     

对硅片上自组装生长的Pentacene薄膜生长机制及其结晶相态的研究

采用热蒸发的方法在硅片衬底上自组装生长的Pentacene薄膜,薄膜在80℃温度下经2 h恒温真空热处理,通过原子力显微镜(AFM)对Pentacene薄膜表面形貌及其生长机制进行研究.结果得到,在硅片上生长的Pentacene薄膜足以台阶岛状结构生长,其岛状直径约为100 nm.且Pentacene分子以垂直于衬底的方向生长,台阶岛状结构中每个台阶的平均高度约为1.54 nnl·s-1,与Pentacene分子的沿长轴方向的长度相近.从Pentacene薄膜的XRD图谱中可以看出,薄膜在形成的过程中会因条件的不同而形成不同的结晶相,分别为薄膜相和三斜体相,且薄膜的结晶相将随着薄膜厚度的增加向三斜体相转变,其临界厚度为80和150 nm,当薄膜大于150 nm时,薄膜的三斜体相占主导地位,而当Pentacene薄膜的厚度小于80 nm时,Pentacene薄膜呈薄膜相存在.     

DV-Xa计算a-SiO2电子结构

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Enhanced performance in organic photovoltaic devices with a KMnO4 solution treated indium tin oxide anode modification

<正>The properties of poly（3-hexylthiophene）:（6,6）-phenyl C₆₁ butyric acid methyl ester（P3HT:PCBM） organic photovoltaic devices（OPVs） with an indium tin oxide（ITO） anode treated by a KMnO₄ solution are investigated.The optimized KMnO₄ solution has a concentration of 50 mg/L,and ITO is treated for 15 min.The modification of ITO anode results in an enhancement of the power conversion efficiency（PCE） of the device,which is responsible for the increase of the photocurrent.The performance enhancement is attributed to the work function modification of the ITO substrate through the strong oxygenation of KMnO₄,and then the charge collection efficiency is improved.     

发光学及其新进展

发光是一种物体把吸收的能量,不经过热的阶段,直接转换为有选择性的特征辐射的现象。这和处于热平衡状态的物体所发出的热辐射是不同的。例如,电视荧光屏的发光,是屏上的发光材料吸收了电子的能量直接转换而来的;而普通白炽电灯的光则是热辐射,是电流使灯丝产生焦耳热,灯丝温度升高而变亮的。虽然对发光现象的研究早在