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Blue emitting exciplex for yellow and white organic light‑emitting diodes

Frontiers of Optoelectronics 2023年第4期16卷 191-203页

作者： kavya Rajeev C.k.Vipin Anjali k.Sajeev Atul Shukla Sarah k.M.McGregor Shih‑Chun Lo Ebinazar B.namdas k.n.narayanan unni Centre for Sustainable Energy Technologies CSIR-National Institute for Interdisciplinary Science and TechnologyThiruvananthapuram 695019India Academy of Scientifc and Innovative Research(AcSIR) Ghaziabad 201002India Centre for Organic Photonics&Electronics The University of QueenslandBrisbaneQLD 4072Australia School of Mathematics and Physics The University of QueenslandBrisbaneQLD 4072Australia School of Chemistry and Molecular Biosciences The University of QueenslandBrisbaneQLD 4072Australia

White organic light-emitting diodes(WOLEDs)have several desirable features,but their commercialization is hindered by the poor stability of blue light emitters and high production costs due to complicated device structures.Herein,we investigate a standard blue emitting hole transporting material(HTM)n,n'-bis(naphthalen-1-yl)-n,n'-bis(phenyl)benzidine(nPB)and its exciplex emission upon combining with a suitable electron transporting material(ETM),3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole(TAZ).Blue and yellow OLEDs with simple device structures are developed by using a blend layer,nPB:TAZ,as a blue emitter as well as a host for yellow phosphorescent dopant iridium(III)bis(4-phenylthieno[3,2-c]pyridinato-n,C2')acetylacetonate(PO-01).Strategic device design then exploits the ambipolar charge transport properties of tetracene as a spacer layer to connect these blue and yellow emitting units.The tetracene-linked device demonstrates more promising results compared to those using a conventional charge generation layer(CGL).Judicious choice of the spacer prevents exciton difusion from the blue emitter unit,yet facilitates charge carrier transport to the yellow emitter unit to enable additional exciplex formation.This complementary behavior of the spacer improves the blue emission properties concomitantly yielding reasonable yellow emission.The overall white light emission properties are enhanced,achieving CIE coordinates(0.36,0.39)and color temperature(4643 k)similar to daylight.Employing intermolecular exciplex emission in OLEDs simplifes the device architecture via its dual functionality as a host and as an emitter.

关键词： Organic light-emitting diodes Dual functional exciplex Spacers Device design strategy Blue exciplex Yellow OLEDs White light emission

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Current advancements on charge selective contact interfacial layers and electrodes in flexible hybrid perovskite photovoltaics

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Journal of Energy Chemistry 2021年第3期30卷 151-173页

作者： Gopalan Saianand Prashant Sonar Gregory J.Wilson Anantha-Iyengar Gopalan Vellaisamy A.L.Roy Gautam E.unni khan Mamun Reza Behzad Bahrami k.Venkatramanan Qiquan Qiao Global Centre for Environmental Remediation(CCER) Faculty of ScienceThe University of NewcastleCallaghan 2308New South WalesAustralia CSIRO Energy Newcastle Energy Centre10 Murray Dwyer CctMayfield WestNSW 2304Australia School of Chemistry and Physics Queensland University of Technology(QUT)2 George StreetBrisbaneQLD 4001Australia Centre for Material Science Queensland University of Technology(QUT)BrisbaneQLD 4000Australia Daegyeong Regional Infrastructure Technology Development Center Kyungpook National UniversityDaegu 41566Republic of Korea James Watt School of Engineering University of GlasgowG128QQUnited Kingdom Facufty of Engineering and Built Environment The University of NewcastleCallaghan 2308New South WalesAustralia Department of Electrical Engineering Center for Advanced PhotovoltaicsSouth Dakota State UniversityBrookings 57007South DakotaUSA Department of Physics SCSVMV Deemed UniversityKanchipuram 631561Tamil NaduIndia

Perovskite-based photovoltaic materials have been attracting attention for their strikingly improved performance at converting sunlight into electricity.The beneficial and unique optoelectronic characteristics of perovskite structures enable researchers to achieve an incredibly remarkable power conversion efficiency.Flexible hybrid perovskite photovoltaics promise emerging applications in a myriad of optoelectronic and wearable/portable device applications owing to their inherent intriguing physicochemical and photophysical properties which enabled researchers to take forward advanced research in this growing field.Flexible perovskite photovoltaics have attracted significant attention owing to their fascinating material properties with combined merits of high efficiency,light-weight,flexibility,semitransparency,compatibility towards roll-to-roll printing,and large-area mass-scale production.Flexible perovskite-based solar cells comprise of 4 key components that include a flexible substrate,semi-transparent bottom contact electrode,perovskite(light absorber layer)and charge transport(electron/hole)layers and top(usually metal)electrode.Among these components,interfacial layers and contact electrodes play a pivotal role in influencing the overall photovoltaic performance.In this comprehensive review article,we focus on the current developments and latest progress achieved in perovskite photovoltaics concerning the charge selective transport layers/electrodes toward the fabrication of highly stable,efficient flexible devices.As a concluding remark,we briefly summarize the highlights of the review article and make recommendations for future outlook and investigation with perspectives on the perovskite-based optoelectronic functional devices that can be potentially utilized in smart wearable and portable devices.

关键词： Perovskite photovoltaics Charge transport layers Contact interface layer Contact electrodes Printable electronics

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同型H-SAPO-5和H-SSZ-24上的乙烯和丁烯齐聚反应:动力学和机理（英文）

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Chinese Journal of Catalysis 2019年第11期40卷 1766-1777页

作者： Christian Ahoba-Sam Marius Westg?rd Erichsen unni Olsbye 奥斯陆大学化学系材料科学和纳米技术中心

B酸型分子筛和分子筛型材料是乙烯转化为高级烯烃的潜在催化剂.本文在C3-C5烯烃形成热力学优于高碳氢化合物的条件下(673-823 k, 1 atm),研究了两种具有AFI结构但酸强度不同的H-SAPO-5和H-SSZ-24催化剂上乙烯、顺式-2-丁烯和乙烯-丁烯... 详细信息

B酸型分子筛和分子筛型材料是乙烯转化为高级烯烃的潜在催化剂.本文在C3-C5烯烃形成热力学优于高碳氢化合物的条件下(673-823 k, 1 atm),研究了两种具有AFI结构但酸强度不同的H-SAPO-5和H-SSZ-24催化剂上乙烯、顺式-2-丁烯和乙烯-丁烯混合物的转化反应.乙烯和顺式-2-丁烯分压分别在9-60和0.9-8.1 kpa范围内变化,接触时间分别在3.78-756和0.573-76.4 s.μmol H^+/cm^3范围内变化.在用于计算速率常数的条件范围内,乙烯转化率小于1%,丁烯转化率小于10%.在酸性较强的H-SSZ-24上乙烯转化率比H-SAPO-5高一个数量级(748 k时为6.5对0.3 mmol/mol H+.S,戊烯=33kPa),乙烯中相应的反应级数较低(673 k时为1.5对2.0),表观活化能较低(698-823 k时52对80 k J/mol).两种催化剂上顺式-2-丁烯转化率以及乙烯和顺式-2-丁烯共进料的表观反应速率存在相似的差异.然而,顺式-2-丁烯转化为C3-C5烯烃受热力学限制的影响很大,妨碍了详细的动力学分析,并导致在最高温度下主要生成异丁烯.

关键词：乙烯齐聚丁烯齐聚动力学分子筛酸强度 H-SAPO-5 H-SSZ-24

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封装Fe(Ⅲ),ni(Ⅱ)和Cu(Ⅱ)的n,n'-双邻羟苯亚甲基-1,2-苯二胺络合物的Y分子筛催化4-氯-3-甲基苯酚氧化反应（英文）

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Chinese Journal of Catalysis 2016年第1期37卷 135-145页

作者： Solomon Legese Hailu Balachandran unni nair Mesfin Redi-Abshiro Isabel Diaz Rathinam Aravindhan Merid Tessema 中央皮革研究所化工实验室亚的斯亚贝巴大学化学系催化与石油化学研究所

将Fe(Ⅲ),ni(Ⅲ)和Cu(Ⅱ)与n,n'-双邻羟苯亚甲基-1,2-苯二胺配位的络合物封装在Y分子筛内,作为多相类Fenton的高级氧化过程的催化剂,用于降解4-氯-3-甲基苯酚(PCMC).采用粉末X射线衍射、热重、n_2吸附-脱附、红外光谱、元素分析和扫描... 详细信息

将Fe(Ⅲ),ni(Ⅲ)和Cu(Ⅱ)与n,n'-双邻羟苯亚甲基-1,2-苯二胺配位的络合物封装在Y分子筛内,作为多相类Fenton的高级氧化过程的催化剂,用于降解4-氯-3-甲基苯酚(PCMC).采用粉末X射线衍射、热重、n_2吸附-脱附、红外光谱、元素分析和扫描电镜对所制催化剂的物化性质进行了表征,并考察了H_2O_2的初始浓度、催化剂用量、温度和pH值等因素对模型有机污染物降解的影响.结果表明,在Fe(Ⅲ),ni(Ⅲ)和Cu(Ⅱ)催化剂作用下,在较低的酸性pH值、催化剂用量0.1 g、H_2O_2的初始浓度0.35 mmol/L的条件下,于50℃反应120 min几乎可以完全去除PCMC.同时还考察了所制PCMC降解催化剂的重复使用性能,提出了可能的催化剂失活机理,也研究了PCMC氧化过程中可能的中间产物和动力学.

关键词：瓶中造船法 4-氯-3-甲基苯酚拟一级反应失活羟基自由基

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青少年股骨骨折：四种固定方法的比较

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中华骨科杂志 2010年第9期30卷 I0032-I0037页

作者： Leonhard E. Ramseier, MD Joseph A. Janicki, MD Shannon Weir, BSc unni G. narayanan MBBS MSc, FRCSC 王东(译) Investigation performed at The Hospital for Sick Children Toronto Ontario Canada 山西医科大学第二医院太原030001

背景：关于青少年股骨骨折的最佳治疗方法还存在争议。本文对四种固定方法的疗效及其并发症进行比较并研究其有关影响因素。方法：我们对189例青少年和儿童的194处股骨骨折分别采用弹性髓内钉、外固定架、普通髓内钉以及接骨板进行治疗... 详细信息

背景：关于青少年股骨骨折的最佳治疗方法还存在争议。本文对四种固定方法的疗效及其并发症进行比较并研究其有关影响因素。方法：我们对189例青少年和儿童的194处股骨骨折分别采用弹性髓内钉、外固定架、普通髓内钉以及接骨板进行治疗，并行回顾性的队列分析。通过对年龄、体重、损伤能量、多发伤、骨折的分级和分型以及粉碎程度的调整，对住院时间、愈合时间以及并发症发生率（包括复位丢失需要再手术、畸形愈合、不愈合、再骨折、感染以及除常规取出植入材料外的其他手术）等治疗结果进行比较。结果：患者的平均年龄为13．2岁，平均体重为49．5kg。其中，应用弹性髓内钉的105处骨折中有2例复位丢失，应用外固定架的33处骨折中有10例复位丢失（p〈0．001）。末次随访时，5例患者肢体缩短≥2．0cm（其中2例应用外固定架，其他组中各l例）。104例（105处）应用弹性髓内钉的患者中有8例需要再手术（复位丢失、再骨折、修复髓内钉、延迟愈合或畸形愈合各2例）。16例应用外固定架的患者需要再手术（其中10例因复位丢失，1例因钉道感染，1例因深层感染行扩创，3例因再骨折，1例因行肢体延长）。1例应用普通髓内钉的患者因为深层感染而行清创术，1例因远端交锁螺钉突出而取出。1例行接骨板固定的患者因再骨折而行二次手术。通过多元统计学分析结果表明：外固定架与弹性髓内钉固定术比较有12．41倍（95％可信区间=2．26-68-31）的复位丢失和（或）畸形愈合风险。结论：在我们应用四种方法所治疗的青少年股骨干骨折患者中外固定架固定术有最高的并发症发生率。尽管其他三种方法也有可比性，但是目前我们仍然不能得出一种最值得推荐的治疗青少年股骨干骨折的最佳治疗方法。手术方式的选择仍然更多地取决于医生的专业知识和经验、患者情况、骨折的具体类型及患者和家属的选择。

关键词：股骨骨折固定方法青少年外固定架固定术并发症发生率弹性髓内钉骨折患者治疗方法

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A monograph on amylases from Bacillusspp.

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Advances in Bioscience and Biotechnology 2013年第2期4卷 227-241页

作者： Sailas Benjamin R. B. Smitha V. n. Jisha S. Pradeep S. Sajith S. Sreedevi Prakasan Priji k. n. unni M. k. Sarath Josh Enzyme Technology Laboratory Biotechnology Division Department of Botany University of Calicut Kerala India

Owing to the production of alpha, beta and gamma amylase subtypes;starch degrading microbes, especially bacteria have an invincible role in the food, fermentation, textile and paper industries. Of them, α-amylases from Bacillus spp. have contributed tremendous advancements in bio-industry, especially in starch, detergent and pharmaceutical arena. Though general reviews are seen in literature on amylases, no focused review is available yet solely on α-amylases produced by Bacillus spp. Hence, this focused review on α-amylases from the genus Bacillus is designed in such a way that it should give a vivid picture on most of the aspects on bacillial α-amylases in a handy module with an industrial perspective. With a short introduction on amylases in general, α-amylases from various species of Bacillus reviewed herein encompasses production of α-amylases by submerged and solid-state fermentations;nutrients and other factors required for maximizing production;immobilization strategies for whole cells or purified enzyme;an overview on the molecular weight of the enzyme;followed by distinct sections for purification, characterisation, stability and crystal structure;and concluded with a section on industrial applications of the α-amylases from Bacillus spp.

关键词： Bacillus Amylases Production Fermentation Crystal Immobilization Stability Molecular Weight Characteristics Applications

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Lignocellulolytic activities of a novel strain of Trichoderma harzianum

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Advances in Bioscience and Biotechnology 2013年第2期4卷 214-221页

作者： M. Rubeena kannan neethu S. Sajith S. Sreedevi Prakasan Priji k. n. unni M. k. Sarath Josh V. n. Jisha S. Pradeep Sailas Benjamin Enzyme Technology Laboratory Biotechnology Division Department of Botany University of Calicut Malappuram India

This study describes a novel dark-green spore producing strain of Trichoderma harzianum exhibiting higher activities of cellulase, hemicellulase and ligninase on specific plate assays. To assess the cellulase production in detail, basal salt medium (BSM) was supplemented with synthetic [carboxymethyl cellulose (CMC), glucose, sucrose, dextrose, lactose or maltose] and natural (flours of banana, banana peel, jack seed, potato or tapioca) carbon as well as nitrogen (yeast extract, beef extract, peptone, nanO3 or nH4nO3) sources. Temperature and pH optima were 28?C and 4, respectively for the growth of the fungus in CMC- BSM with 146 U/ml cellulase activity. Flours of potato and banana supported comparable yields of cellulase to that of CMC (147 U/ml and 168 U/ml, respectively), while sodium nitrate was the preferred nitrogen source (150 U/ml). The water soluble yellowish-green pigment (a probable siderophore) extracted from the spores showed an absorption maximum at 414 nm. To comprise, this fungus shows the complete lignocellulolytic potential which offers great industrial significance, especially for the ethanol production from the lignocellulosic waste coupled with the production of a new pigment.

关键词： Trichoderma harzianum Morphology Submerged Fermentation Yellowish-Green Pigment

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A novel strain of Trichoderma virideshows complete lignocellulolytic activities

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Advances in Bioscience and Biotechnology 2012年第8期3卷 1160-1166页

作者： kannan neethu M. Rubeena S. Sajith S. Sreedevi Prakasan Priji k. n. unni M. k. Sarath Josh V. n. Jisha S. Pradeep Sailas Benjamin Enzyme Technology Laboratory Biotechnology Division Department of Botany University of Calicut Malappuram India

In this study we describe a novel dark-green strain of Trichoderma viride exhibiting complete ensemble of cellulase, hemicellulase and ligninase activities on specific plate assays. To assess the cellulase production in detail, basal salt medium (BSM) was fortified with synthetic (carboxymethyl cellulose (CMC), glucose, sucrose, dextrose, lactose or maltose) and natural (flours of banana, banana peel, jack seed, potato or tapioca) carbon as well as nitrogen (yeast extract, beef extract, peptone, nanO3 or nH4nO3) sources. Temperature and pH optima were 28°C and 4, respectively for the growth of the fungus in CMC-BSM with 137 U/mL cellulase activity, which was enhanced to 173 U/mL at 1.25% CMC concentration. Flours of potato and banana peel supported comparable yields of cellulase to that of CMC, while sodium nitrate was the preferred nitrogen source. The water soluble bluish-green pigment (a probable siderophore) extracted from the spores showed an absorption maximum at 292 nm. To sum up, the complete lignocellulolytic potential of this fungus offers great industrial significance, coupled with the production of a new pigment.

关键词： Trichoderma viride Morphology Liquid Fermentation Bluish-Green Pigment

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Rubber Seed kernel as Potent Solid Substrate for the Production of Lipase by Pseudomonas aeruginosa Strain BUP2

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Advances in Enzyme Research 2015年第2期3卷 31-38页

作者： k. n. unni Panichikkal Abdul Faisal Prakasan Priji Sreedharan Sajith Sreedharan Sreedevi E. S. Hareesh Trikariyoor Asokan nidheesh Roy Sailas Benjamin Enzyme Technology Laboratory School of Biosciences University of Calicut Kerala India

This study explored the utility of flours of rubber seed, coconut and groundnut kernels, and de-oiled cakes of coconut and groundnut as solid substrate for the production of lipase by Pseudomonas aeruginosa strain BUP2 (MTCC no. 5924), a novel bacterium reported from the rumen of Malabari goat. Various proportions (10%, 20%, 30%, 40% or 50%) of flours or cakes were prepared (w/v) with BUP medium (pH 4, 5, 6, 7 or 8), and incubated at different temperature (25°C, 28°C, 30°C or 32°C) for 24 to 96 h. The samples were assayed for lipase activity at 24 h intervals. The rubber seed flour (20%)-BUP medium supported the maximum lipase production (871 U/gds) at 48h incubation (pH 6, 28°C), followed by ground nut flour (398 U/gds), while ground nut cake supported the least lipase production (244 U/gds). From this, it is evident that the cheaply available rubber seed is an efficient substrate for the production of lipase, irrespective of its known demerit that it contains the limarin, a toxin;in fact, we could not detect limarin in the fermented matter. Thus, the utility of rubber seed for the production of a costly enzyme is reported from a novel rumen bacterium, which would be advantageous for rubber farmers.

关键词： Pseudomonas aeruginosa BUP2 Lipase Solid-State Fermentation BUP Medium Rubber Seed Flour

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Pseudomonas aeruginosaBUP2—A novel Strain Isolated from Malabari Goat Produces Type 2 Pyoverdine

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Advances in Bioscience and Biotechnology 2014年第11期5卷 874-885页

作者： kizhakkepowathial nair unni Prakasan Priji Valerie A. Geoffroy Mukesh Doble Sailas Benjamin Enzyme Technology Laboratory Biotechnology Division Department of Botany University of Calicut Malappuram India Laboratoire de Microbiologie et de Génétique CNRS UPRES-A 7010 Université Louis-Pasteur Strasbourg France Department of Biotechnology Indian Institute of Technology Madras Chennai India

This study focuses on the isolation and characterization of a novel strain of siderophore producing bacterium, i.e., Pseudomonas aeruginosa BUP2 (Pa BUP2) from the rumen of Malabari goat, coupled with qualitative and quantitative analyses of the siderophore produced by it. Pa BUP2—a facultative anaerobe was tuned to be an aerobe by repeatedly growing in Benjamin flask. The new isolate was grown in a specially designed semi-synthetic medium, designated as BUP medium, and the yellowish-green pigment produced was identified as a typical siderophore by spectrophotometry, Chromazurol-S assay, thin layer chromatography and isolectric focusing (IEF). The characteristic orange fluorescence upon UV irradiation on chromatogram and absorption maximum at λ404 confirmed that the characteristic siderophore produced by Pa BUP2 was a typical pyoverdine (PVD). This PVD was further categorized under type 2 by comparing its profile on the IEF gel with that of the representative strains of each PVD types, viz., Pa O1, Pa ATCC 27853 and Pa6. Moreover, the type 2 PVD was purified by XAD-4 Amberlite column chromatography and quantified;maximum yield (11.17 mg/ml) was observed on day 4 of incubation (37°C). Thus, it was confirmed that the bacterium isolated from the rumen content of Malabari goat is a novel strain of Pa capable of producing large quantity of PVD type 2 in specially designed BUP medium under aerobic condition, and that its clinical and industrial implications remain elusive.

关键词： Pseudomonas aeruginosa BUP2 Siderophore Pyoverdine Type 2 Isoelectric Focusing

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