Study of Photostimulable Luminescence Materials Sr_9Ca(PO_4)_6Cl_2:Eu

The polycrystalline Sr_9Ca(PO_4)_6Cl_2:Eu has been synthesized by solid state reaction.The reaction condition,the appropriate raw materials and their quantity used,which may affect the photostimulable luminescence (PSL),have been systematically inves- tigated.The properties of this PSL phosphor as a material for storing and reproducing the X-ray image in computer-aided radiography have been reported briefly.

Sonoluminescence as the PeTa Radiation

In this paper, a model of cavitational luminescence (CL) and sonoluminescence (SL) is developed. The basis of the model is the PeTa (Perel’man-Tatartchenko) effect—a characteristic radiation under first-order phase transitions. The main role is given to the liquid, which is where the cavitation occurs. The evaporation of the liquid and subsequent vapor condensation inside the bubble are responsible for the CL and SL. Apparently, the dissolved gases and other impurities in the liquid are responsible for peaks that appear at the background of the main spectrum. They most likely are excited by a shock wave occurred during cavitation. The model explains the main experimental data. Thus, no mystery, no plasma, no Hollywood.

A Two-dimensional Anthracene-9,10-dicarboxylate Zinc(Ⅱ) Coordination Polymer Based on Binuclear [Zn_2Cl_2] Nodes: Synthesis, Characterization and Luminescent Properties

A two-dimensional（2D） 44 topological ZnⅡ coordination polymer {[Zn2Cl2（L）（4bpy）2]}∞（H2L = anthracene-9,10-dicarboxylic acid, 4bpy = 4,4ˊ-bipyridine） based on binuclear [Zn2Cl2] nodes has been synthesized and characterized by IR, elemental analysis, X-ray powder diffraction and single-crystal X-ray diffraction analysis. Moreover, the luminescent properties of the correspon- ding compound have been briefly investigated.

Sonoluminescence as the PeTa Radiation, Part Two

This paper is a continuation of one published in this journal nine months ago. The two papers present a model of cavitational luminescence (CL), multi-bubble sonoluminescence (MBSL), one-bubble sonoluminescence (OBSL), and laser-induced bubble luminescence (LIBL). The basis of this model is the PeTa (Perel’man-Tatartchenko) effect, a nonequilibrium characteristic radiation under first-order phase transitions, especially vapour condensation. In this model, the main role is given to the liquid, where the evaporation, condensation, flash, and subsequent collapse of bubbles occur. The instantaneous vapour condensation inside the bubble is a reason for the CL/MBSL/OBSL/LIBL. Apparently, the dissolved gases and other impurities in the liquid are responsible for peaks that appear at the background of the main spectrum. They are most likely excited by a shock wave occurred during the collapse. This paper, in contrast to the previous one, presents a slightly expanded model that explains additional experimental data concerning especially the LIBL spectrum. As a result, today we are not aware of any experimental data that would contradict the PeTa model, and we continue to assert that there is no mystery to the CL/MBSL/OBSL/LIBL phenomena, as well as no reason to hope that they can be used for high-temperature chemical reactions, and even more so for a thermonuclear ones.

Sonoluminescence as the PeTa Radiation, Part Three

This paper is the third in a series published in this journal during 2017-2018. These three papers present various stages in the development of the PeTa model for phenomena of the same physical nature: cavitational luminescence (CL), multi-bubble sonoluminescence (MBSL), single-bubble sonoluminescence (SBSL), and laser-induced bubble luminescence (LIBL). The basis of this model is the PeTa (Perel’man-Tatartchenko) effect—a nonequilibrium characteristic radiation under first-order phase transitions, for instance, vapour condensation. The third iteration of this model “Vapour bubble luminescence” (VBL) is presented in this paper. The essence of this model is as follows: with a local decrease of pressure or an increase of temperature in a tiny volume of the liquid, one or several bubbles filled with vapour will appear. Subsequently, a very rapid increase in pressure or a decrease in temperature of the bubble leads to super-saturation of the vapour inside the bubble, followed by its instantaneous condensation with the emission of condensation energy (this is the PeTa effect). A sharp decrease in pressure causes the collapse of the bubble accompanied by a shock wave in the liquid. VBL model is conveniently represented on the solid-liquid-vapour phase diagram. A better understanding of the physical nature of the phenomena under consideration could help to find their useful applications. To develop this idea further, we propose a design of a cavity-free pulsed laser on the basis of CL/MBSL/SBSL. An analysis of LIBL in cryogenic liquids is also given in this paper.

白光LED用新型红色荧光粉Sr_5(BO_3)_3Cl:Eu^(3+)的制备与发光特性

采用高温固相法合成了Sr5(BO3)3Cl:Eu3+新型红色发光材料,并对其结构和发光特性进行了研究。X射线衍射测试表明合成材料为纯相Sr5(BO3)3Cl晶体。材料的主发射峰位于587,596,613nm和626nm,对应Eu3+的5 D0→7F1,7F2辐射跃迁。监测626nm发射峰,激发光谱主峰位于392nm,可被InGaN管芯有效激发。通过时间分辨光谱测得Eu3+离子5 D0能级的荧光寿命约为2.28ms。研究了Eu3+离子掺杂浓度对Sr5(BO3)3Cl:Eu3+发光性能的影响,结果随着Eu3+离子浓度的增大,样品的发光强度先增大后减小,最佳掺杂浓度为16%(摩尔分数)。计算了Eu3+离子浓度猝灭的临界距离为1.46nm。测量了不同Eu3+浓度样品的色坐标,均位于色品图红光区,符合NTSC标准。

紫外线辐照能量对BaFCl：Eu^（2＋）光激励发光的影响

通过改变紫外线辐照能量，研究了ＢａＦＣｌ：Ｅｕ（２＋）的光激励发光性质．发现当紫外线能量大于或小于Ｅｕ（２＋）最低激发态能量两种情况下，光激励发光有明显的差异，还分析了产生差异的原因，并且给出了紫外线辐照能量与Ｆ／Ｃｌ比值的关系．

X射线和紫外线激发下BaFCl_xBr_(1-x):Eu^(2+)的发光

制备了ＢａＦＣｌｘＢｒ１－ｘ：Ｅｕ２＋（ｘ＝００，０２，０４，０６，０８，１０）四元系列氟卤化合物．对于不同的Ｃｌ／Ｂｒ比值样品，研究了其在Ｘ射线和紫外线激发下的发光性质；同时研究了在Ｘ射线激发下的发光强度随温度的变化关系，并发现这种关系随Ｃｌ／Ｂｒ比值的变化呈现一定的规律性；最后，测量了在紫外线激发下。

^(147)Pm激发的ZnS∶Cu,Cl发光粉的研究

以高纯ZnS粉末为基质,采用高温转相、扩散,以及表面涂敷工艺,制得了147Pm激发的ZnS∶Cu,Cl发光粉。分析了ZnS∶Cu,Cl的晶体结构,测量了ZnS∶Cu,Cl的激发光谱、发射光谱、发光亮度。其晶体结构主要是六方纤锌矿型结构,激发光谱峰值波长为341nm,发射光谱峰值波长为513nm,初始发光亮度达到312mcd/m2。由激发光谱的峰值波长341nm推算得到六方ZnS晶体的禁带宽度为3.64eV。分析了147Pm激发的ZnS∶Cu,Cl发光粉的发光寿命,其发光寿命达到5年以上。还探讨了该放射性发光粉的发光机理。147Pm激发的ZnS∶Cu,Cl的稳定发光,实际上是激发过程与复合过程的准平衡。ZnS∶Cu,Cl的绿色发光来源于深施主-深受主对的复合发射。实验结果的分析表明,ZnS∶Cu,Cl中深施主-深受主之间的能级间隔约为2.42eV。

Ca_2BO_3Cl:Ce^(3+),Tb^(3+):A novel tunable emitting phosphor for white light-emitting diode

Ca2BO3Cl：Ce3＋, Ca2BO3Cl：Tb3＋, and Ca2BO3Cl：Ce3＋, Tb3＋ phosphors are synthesized by a high temperature solid-state reaction. The emission intensity of Ce3＋ or Tb3＋ in Ca2BO3Cl is influenced by the Ce3＋ or Tb3＋ doping content, and the optimum concentrations of Ce3＋ and Tb3＋ are 0.03 tool and 0.05 mol, respectively. The concentration quenching effect of Ce3＋ or Tb3＋ in Ca2BO3Cl occurs, and the concentration quenching mechanism is d-d interaction for either Ce3＋ or Tb3＋. The Ca21303Cl：Ce3＋, Tb3＋ can produce colour emission from blue to green by properly tuning the relative ratio between Ce3＋ and Tb3＋, and the emission intensity of Tb3＋ in Ca2BO3Cl can be enhanced by the energy transfer from Ce3＋ to Tb3＋. The results indicate that Ca2BO3Cl：Ce3＋, Tb3＋ may be a promising double emission phosphor for UV-based white light emitting diodes.

A novel white emitting phosphor Ca_2PO_4Cl:Dy^(3+): luminescence, concentration quenching and thermal stability

A novel white emitting phosphor Ca2PO4Cl：Dy^3＋ was synthesized by a solid state method. The luminescence, concentration quenching and thermal stability of Ca2PO4Cl：Dy^3＋ were investigated. Ca2PO4Cl：Dy^3＋ showed three emission peaks, which were located at 483, 575 and 660 nm. Though the ratio of yellow to blue emission intensities showed a similar value, the intensities of yellow and blue peaks were influenced by Dy^3＋ concentration, and the concentration quenching effect was observed. The emission intensity of Ca2PO4Cl：Dy^3＋ as a function of temperature was explored and the emission intensity（at 150 °C） of Ca2PO4Cl：Dy^3＋ was 90.0% of the value at 25 °C, and activation energy was 0.18 eV. The results indicated that Ca2PO4Cl：Dy^3＋ might be conducive to development of white LEDs.

溅射方法生长的氧化锌薄膜的阴极射线和光致发光特性

近紫外光发射氧化锌薄膜是一种新兴的发光材料 ,它的发光波长比氮化镓的蓝光波长更短 ,在光存储应用中可以进一步提高光存储的密度 ,因而在光电子领域具有重要应用价值而备受关注。在此介绍我们用直流反应溅射方法在硅衬底上生长的氧化锌薄膜 ,观察了它们的阴极射线发光和光致发光光谱 ,研究了发光与薄膜晶体结构 ,以及发光与激发电子束流的关系等。

掺杂型层状稀土氢氧化物YEu-LRH及4-联苯甲酸复合体的合成及发光性质

采用水热和回流2种方法合成了Cl-型层状稀土氢氧化物(Cl-LRH)(R为Y0.95Eu0.05),以此为前体,与去质子的4-联苯甲酸(加入NaOH)进行离子交换,合成了4-联苯甲酸根-YEu-LRH复合体.用XRD、FT-IR及PL等方法研究了其结构及性质,证明4-联苯甲酸根插入Cl-LRH层间,并发现其在层间有2种不同排列方式.与前体相比,所得复合体发光强度明显增强.

化学发光酶免疫分析研究进展

叙述了化学发光免疫分析的分类及特点,从发光底物、增强剂、过氧化物酶、过氧化物及其他方面,对鲁米诺类化合物化学发光酶免疫分析的进展进行了综述,引用文献34篇。

Mg掺杂AlGaN的特性研究

采用金属有机物化学气相淀积方法在Al2O3衬底上生长不同浓度Mg掺杂的AlxGa1-xN合金薄膜,并在750℃、N2气氛下对Mg进行热退火激活。用X射线衍射ω-2θ扫描计算确定样品的Al组分,发现Mg摩尔掺杂浓度和退火对Al组分均未产生明显影响。X射线衍射摇摆曲线与原子力显微镜扫描表明随Mg摩尔掺杂浓度增加,样品晶体质量下降,样品表面凹坑增加,但热退火对薄膜表面形貌有明显的改善。阴极射线发光测量发现带边峰强度随掺杂浓度增加而减弱,退火后样品的施主-受主对复合发射与导带受主的复合发射均有增强,验证了热退火对钝化受主杂质的激活作用,对实现高效AlGaN的p型掺杂具有重要意义。

化学气相沉积法制备β-Ga_2O_3纳米结构及其缺陷发光性质研究

利用化学气相沉积法(CVD),在不同压强下分别得到β-Ga2O3纳米线(NWs)和纳米带(NBs)。研究结果表明,获得的NWs与NBs均为单斜结构的β-Ga2O3,且NWs结晶质量优于NBs。在阴极射线发光(CL)光谱中,发现NWs与NBs在近紫外和蓝光波段有较强的发光。对比NWs与NBs的CL光谱,推断β-Ga2O3在374 nm和459 nm的近紫外和蓝色发光峰分别来自于Ⅰ型和Ⅱ型氧空位(VO(I)和VO(Ⅱ))的缺陷复合。

氮氯共掺杂石墨烯量子点的合成及其对汞离子检测

以果糖、乙二胺、盐酸为原料,采用水热法将N、Cl原子掺杂在石墨烯量子点上,制备出氮氯共掺杂石墨烯量子点(N,Cl-GQDs),利用透射电镜、X射线光电子能谱、紫外-可见吸收光谱、荧光光谱等手段对其结构和性能进行了表征。结果表明:合成的N,Cl-GQDs为分散效果良好的球形,与单独氮掺杂及未掺杂的石墨烯量子点相比,双元素掺杂石墨烯量子点具有更好的光学性能。同时利用电化学发光淬灭原理构建了传感器,实现了对汞离子的检测,计算得出检测限为0.03ng/mL。

醇蒸气发光敏感器用聚4-乙烯基吡啶铂(Ⅱ)配合物的研究

将小分子金属配合物[Pt(C^N^N)Cl](HC^N^N=6-(4-苯基)-2,2′-联吡啶)连接到高分子P4VP(聚4-乙烯基吡啶)侧链上,制备了聚4-乙烯基吡啶铂(Ⅱ)配合物[(P4VP)Pt(C^N^N)]Cl。此高分子配合物旋涂膜对醇蒸气具有高度的识别响应能力:膜的荧光强度在醇蒸气中迅速猝灭。而在氮气流中,荧光又能够重新开启。整个过程可逆、迅速。膜对不同醇蒸气的敏感能力差别顺序为:甲醇>乙醇>异丙醇。并且荧光强度变化和醇蒸气浓度在一定范围内,具有好的线性关系。此外膜对以上醇蒸气的监测LOD(limit of detection)分别是9.5、16.1和11 ppm。

Bubble Glow at Hydrothermal Vents as the <i>PeTa</i>Radiation

The paper presents a physical model of a natural phenomenon, the glow of bubbles at hydrothermal vents formed during underwater volcanic activity. The basis of the model is characteristic non-equilibrium radiation under first order phase transitions that since 2010 has been referred to as the PeTa (Perelman-Tatartchenko) effect. This is the fourth paper in a series developing the model for similar physical phenomena: cavitational luminescence (CL), multi-bubble sonoluminescence (MBSL), single-bubble sonoluminescence (SBSL) and laser-induced bubble luminescence (LIBL). The previous three papers were published during 2017-2018 in this Journal. In the third one we have shown that above mentioned physical effects can be generalized as a phenomenon that we have titled “Vapour bubble luminescence” (VBL). VBL is very clearly represented in a non-equilibrium phase diagram. The essence of VBL is as follows: when there is a local decrease in pressure and/or an increase of temperature in a tiny volume of a liquid occurs, one or several bubbles filled with vapour will appear. Subsequently a very rapid pressure increase and/or temperature decrease in the same volume of liquid leads to supersaturation of the vapour inside the bubble. Upon reaching critical vapor density, instantaneous vapour condensation and emission of the phase transition energy that is accompanied by a flash (this is the PeTa effect) results in a sharp pressure decrease and the bubble collapses due to the pressure drop. This process is accompanied by a shock wave in the liquid. A similar effect occurs if bubbles filled with hot steam, for example from a cappuccino machine, are injected into a relatively large volume of cold water. The VBL model explains all experimental data concerning CL/MBSL/SBSL/LIBL and the relatively new natural phenomenon, the glow of bubbles at hydrothermal vents. Several model experiments demonstrate the PeTa effect under similar conditions. Additionally, we define the PeTa effect in all its manifestations on a non-equilibrium phase diagram. This clarifies which niches can contain VBL processes. We also demonstrate the window of transparency (WT) for the PeTa radiation during crystallization of a supercooled tellurium melt and propose the design of a cavity-free pulsed laser on the basis of similar crystallization processes.

F／Cl比与Eu^（2＋）：BaFCl中F色心的浓度和光激励截面的关系

研究了Ｅｕ（２＋）：ＢａＦｘＣｌ２在紫外线辐照下的光激励发光。通过改变激励方式及激励光的扫描方向，给出了Ｅｕ（２＋）：ＢａＦｘＣｌ２－ｘ光激励发光过程中，两种Ｆ色心的浓度比值与光激励截面比值的测定方法。利用这种测定方法，进一步研究了两种Ｆ色心的浓度比值和光激励截面比值与Ｆ／ＣＩ比值的关系。