Dual effect synergistically triggered Ce:(Y,Tb)3(Al,Mn)5O12 transparent ceramics enabling a high color-rendering index and excellent thermal stability for white LEDs

Ce:Y₃Al₅O₁₂ transparent ceramics (TCs) with appropriate emission light proportion and high thermal stability are significant to construct white light emitting diode devices with excellent chromaticity parameters. In this work, strategies of controlling crystal-field splitting around Ce³⁺ ion and doping orange-red emitting ion, were adopted to fabricate Ce:(Y,Tb)₃(Al,Mn)₅O₁₂ TCs via vacuum sintering technique. Notably, 85.4 % of the room-temperature luminescence intensity of the TC was retained at 150 °C, and the color rendering index was as high as 79.8. Furthermore, a 12 nm red shift and a 16.2 % increase of full width at half maximum were achieved owing to the synergistic effects of Tb³⁺ and Mn²⁺ ions. By combining TCs with a 460 nm blue chip, a warm white light with a low correlated color temperature of 4155 K was acquired. Meanwhile, the action mechanism of Tb³⁺ ion and the energy transfer between Ce³⁺ and Mn²⁺ ions were verified in prepared TCs.     

An investigation into the cause of loss of containment from the supply of mini-bulk lubricants

An Intermediate Bulk Container (IBC) was punctured during its handling, releasing oil onto soil at an environmentally-sensitive region of Australia. The telehandler did not pierce the plastic of the IBC directly (as was expected) but rather one of the tynes had caught on the underside of the metal base plate, despite numerous controls being in place at time of spill, revealing a previously unreported mechanism for a fluid spill from handling of petroleum hydrocarbons. The diverse investigation team used a root cause analysis (RCA) technique to identify the underlying cause: the inspection process was inadequate with contributing factors of not using a spotter and design of IBC did not anticipate conditions. Engineering controls were put in place as part of the change management process to help prevent spills from occurring from piercing from telehandler tynes on the current project site.     

An ideal host-guest system to accomplish high-performance greenish yellow and hybrid white organic light-emitting diodes

Greenish yellow organic light-emitting diodes (GYOLEDs) have steadily attracted researcher's attention since they are important to our life. However, their performance significantly lags behind compared with the three primary colors based OLEDs. Herein, for the first time, an ideal host-guest system has been demonstrated to accomplish high-performance phosphorescent GYOLEDs, where the guest concentration is as low as 2%. The GYOLED exhibits a forward-viewing power efficiency of 57.0 lm/W at 1000 cd/m², which is the highest among GYOLEDs. Besides, extremely low efficiency roll-off and voltages are achieved. The origin of the high performance is unveiled and it is found that the combined mechanisms of host-guest energy transfer and direct exciton formation on the guest are effective to furnish the greenish yellow emission. Then, by dint of this ideal host-guest system, a simplified but high-performance hybrid white OLED (WOLED) has been developed. The WOLED can exhibit an ultrahigh color rendering index (CRI) of 92, a maximum total efficiency of 27.5 lm/W and a low turn-on voltage of 2.5 V (1 cd/m²), unlocking a novel avenue to simultaneously achieve simplified structure, ultrahigh CRI (>90), high efficiency and low voltage.     

Platinum Binuclear Complexes as Phosphorescent Dopants for Monochromatic and White Organic Light‐Emitting Diodes

Efficient blue‐, green‐, and red‐light‐emitting organic diodes are fabricated using binuclear platinum complexes as phosphorescent dopants. The series of complexes used here have pyrazolate bridging ligands and the general formula C^∧NPt(μ‐pz)₂PtC^∧N (where C^∧N = 2‐(4′,6′‐difluorophenyl)pyridinato‐N,C^2′, pz = pyrazole ( 1 ), 3‐methyl‐5‐tert‐butylpyrazole ( 2 ), and 3,5‐bis(tert‐butyl)pyrazole ( 3 )). The Pt–Pt distance in the complexes, which decreases in the order 1 > 2 > 3 , solely determines the electroluminescence color of the organic light‐emitting diodes (OLEDs). Blue OLEDs fabricated using 8 % 1 doped into a 3,5‐bis(N‐carbazolyl)benzene (mCP) host have a quantum efficiency of 4.3 % at 120 Cd m^–2, a brightness of 3900 Cd m^–2 at 12 V, and Commission Internationale de L'Eclairage (CIE) coordinates of (0.11, 0.24). Green and red OLEDs fabricated with 2 and 3 , respectively, also give high quantum efficiencies (～ 6.7 %), with CIE coordinates of (0.31, 0.63) and (0.59, 0.46), respectively. The current‐density–voltage characteristics of devices made using dopants 2 and 3 indicate that hole trapping is enhanced by short Pt–Pt distances (< 3.1 Å). Blue electrophosphorescence is achieved by taking advantage of the binuclear molecular geometry in order to suppress dopant intermolecular interactions. No evidence of low‐energy emission from aggregate states is observed in OLEDs made with 50 % 1 doped into mCP. OLEDs made using 100 % 1 as an emissive layer display red luminescence, which is believed to originate from distorted complexes with compressed Pt–Pt separations located in defect sites within the neat film. White OLEDs are fabricated using 1 and 3 in three different device architectures, either with one or two dopants in dual emissive layers or both dopants in a single emissive layer. All the white OLEDs have high quantum efficiency (～ 5 %) and brightness (～ 600 Cd m^–2 at 10 V).     

基于手写笔的多功能电子白板系统的实现

该文针对当前电子白板系统对个性化支持的不足,引入手写笔作为输入设备,充分利用其功能参数,设计开发了具有模拟毛笔、钢笔、铅笔等真实笔特征的多笔型功能的电子白板系统。     

防垢剂BZF－2的研制与应用

桩西油田产出原油综合含水已达６０％－７０％，原用防垢剂ＨＥＤＰ已失去有效抑制集输站结垢的性能。本工作针对结垢最严重的桩５２站的应用，研制了以有机膦化合物和聚氧乙烯醚为主成份的防垢剂ＢＺＦ－２，在室内考察了不同条件下的防垢率、腐蚀性、配伍性等性能，在桩５２站进行了为期４个月的现场试验，加量为１０．３ｍｌ／ｌ、防垢率≥９８．０％，加药设备管线的腐蚀率大大降低。     

腐殖酸对烤烟根系生长和生理活性的影响

对腐殖酸和基肥混施进行了烤烟盆栽试验。结果表明 ,腐殖酸能有效刺激根系的生理活性 ,提高根系抗坏血酸氧化酶、多酚氧化酶等呼吸酶的活性 ,增强根系的活力 ,并能有效促进烤烟根系生长 ,根干重、体积和长度均有提高。     

微波处理对离体黄瓜子叶生根和根活力的影响

用辐射功率200W微波（2450MHz）处理6～16，明显促进离体黄瓜子叶生根．根长和根鲜重增加。不同辐射强度和辐服时间对离体黄瓜子叶生根有不同影响。用TTC法测定，微波处理后与根活力相关的OD值比对照体增加了。用温箱模拟FISO微波炉功率为200W的温度，不同处理时间处理离体黄瓜子叶，没有发现促进生根。说明在一定条件下，微波辐射处理离体黄瓜子叶促进生根．主要是微波的辐射效应。     

复合乳化沥青的粘附性试验方法研究

鉴于目前使用的阳离子乳化沥青粘附性试验方法难以有效评价复合乳化沥青粘附性，通过试验研究并综合考虑乳化沥青施工和路用实际情况，提出了乳化沥青水煮法试验方法和采用该方法检验复合乳化沥青粘附性时的评定标准。     

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钻井液润滑剂是一种重要的钻井液化学处理剂，它的作用是改善钻井液润滑性，降低井壁与钻具（或套管）之间的磨擦，降低钻柱旋转扭矩和起下钻阻力，从而减少卡钻事故的发生。文章根据目前使用的白油钻井液润滑剂存在的不足，提出研制一种新型白油钻井液润滑剂。通过正交实验优选了润滑剂配方。经室内实验和现场实验证明该产品润滑性能好，与钻井液配伍性好，无毒性对环境影响小。