Search Results - "NARAYANAN UNNI, K. N"

Low temperature-processed ZnO thin films for p-n junction-based visible-blind ultraviolet photodetectors by B, Hanna, K P, Surendran, K N, Narayanan Unni

“…Ultraviolet (UV) photodetectors have drawn extensive attention due to their numerous applications in both civilian and military areas including flame…”
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Reversible Shift from Excitonic to Excimer Emission in Fluorescent Organic Light-Emitting Diodes: Dependence on Deposition Parameters and Electrical Bias by Soman, Anjaly, Sajeev, Anjali K, Rajeev, Kavya, K. N, Narayanan Unni

“…Organic light-emitting diodes (OLEDs), in general, require multilayer devices and microcavity structures for emission tuning, which increases the complexity…”
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Blue emitting exciplex for yellow and white organic light-emitting diodes by Rajeev, Kavya, Vipin, C. K., Sajeev, Anjali K., Shukla, Atul, McGregor, Sarah K. M., Lo, Shih-Chun, Namdas, Ebinazar B., Narayanan Unni, K. N.

“…White organic light-emitting diodes (WOLEDs) have several desirable features, but their commercialization is hindered by the poor stability of blue light…”
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Amplified Spontaneous Emission from Zwitterionic Excited-State Intramolecular Proton Transfer by Shukla, Atul, Mai, Van Thi Ngoc, Divya, Velayudhan V., Suresh, Cherumuttathu H., Paul, Megha, Karunakaran, Venugopal, McGregor, Sarah Katariina Martikainen, Allison, Ilene, Narayanan Unni, K. N., Ajayaghosh, Ayyappanpillai, Namdas, Ebinazar B., Lo, Shih-Chun

“…The unique four-level photocycle characteristics of excited-state intramolecular proton transfer (ESIPT) materials enable population inversion and large…”
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Heterostructured MoS2-RuO2 nanocomposite: A promising electrode material for supercapacitors by Manuraj, M., Chacko, Jomiya, Narayanan Unni, K.N., Rakhi, R.B.

“…A heterostructured nanocomposite material consisting of MoS2 nanowires and RuO2 nanoparticles has been synthesized by an easy hydrothermal method and a simple…”
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Structural Integration of Carbazole and Tetraphenylethylene: Ultrafast Excited‐State Relaxation Dynamics and Efficient Electroluminescence by McGregor, Sarah K. M., Govind, Chinju, Wood, Michael K. R., Shukla, Atul, Lim, Hyunsoo, Lepage, Romain J., Krenske, Elizabeth H., K. N., Narayanan Unni, Ajayaghosh, Ayyappanpillai, Karunakaran, Venugopal, Namdas, Ebinazar B., Lo, Shih-Chun

“…The synthesis, characterization, and spectroscopic investigations of a new solution‐processable N‐styrylcarbazole‐linked tetraphenylethylene (TPE) derivative…”
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Influence of Polymer Gate Dielectric on Organic Field‐Effect Transistors: Interdependence of Molecular Weight, Solvent Polarity, and Surface Energy—A Case Study with PMMA and Pentacene by V. R., Rajeev, Pillai, Sradha, Nunzi, Jean‐Michel, Unni K. N., Narayanan

“…The semiconductor/dielectric interface controls the performance of organic field‐effect transistors (OFETs). Herein, the influence of both the molecular weight…”
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Thermally Activated Delayed Fluorescent Solvent‐free Organic Liquid Hybrids for Tunable Emission Applications by Nidhankar, Aakash D., Goudappagouda, Kothavade, Premkumar, Dongre, Sangram D., Dnyaneshwar Veer, Sairam, Ranjan Dash, Soumya, Rajeev, Kavya, Unni, K. N. Narayanan, Shanmuganathan, Kadhiravan, Santhosh Babu, Sukumaran

“…The synthetic feasibility and excellent luminescence features of organic molecules attracted much attention and were eventually found useful in lighting…”
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Improving the contrast ratio of OLED displays: An analysis of various techniques by Singh, Ranbir, Narayanan Unni, K.N., Solanki, Ankur, Deepak

“…► Detailed explanation of ambient contrast ratio (CR) in OLEDs given. ► Several techniques used for increasing the ambient contrast ratio are discussed and…”
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Influence of the polymer dielectric characteristics on the performance of a quaterthiophene organic field-effect transistor by NARAYANAN UNNI, K. N, DABOS-SEIGNON, Sylvie, NUNZI, Jean-Michel

“…Organic field-effect transistors were fabricated with quaterthiophene as the active material and various polymeric dielectrics as the gate insulator. The…”
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Aggregation induced light harvesting of molecularly engineered D-A-π-A carbazole dyes for dye-sensitized solar cells by Hemavathi, B., Jayadev, V., Pradhan, Sourava C., Gokul, G., Jagadish, Kusuma, Chandrashekara, G.K., Ramamurthy, Praveen C., Pai, Ranjith Krishna, Narayanan Unni, K.N., Ahipa, T.N., Soman, Suraj, Geetha Balakrishna, R.

“…[Display omitted] •Dyes with cyanopyridine auxiliary acceptor were synthesized.•J-aggregation leads to broader absorption spectra.•Aggregation assisted in…”
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Butterfly‐Shaped Thiophene‐Pyridine Hybrids: Green Electroluminescence and Large Third‐Order Optical Nonlinearities by Kakekochi, Viprabha, Gangadharappa, Sathish Chatnahalli, Nikhil, P. P., Chandrasekharan, Keloth, Darshan, Vibhu, Narayanan Unni, K. N., Dalimba, Udaya Kumar

“…A set of four symmetric, butterfly‐shaped 4‐(4‐(decyloxy)phenyl)‐2,6‐di(thiophen‐2‐yl)pyridine (TPY) derivatives 2TPA‐TPY (TPY center and triphenylamine end…”
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Solution processable carbazole derivatives for dopant free single molecule white electroluminescence by room temperature phosphorescence by Krishna, Athira, Darshan, Vibhu, Suresh, Cherumuttathu H., Narayanan Unni, K.N., Varma, Ramavarma Luxmi

“…[Display omitted] •Two carbazole molecules, namely Cz(PhCF3)2 and Cz(PhBz)2 were synthesized.•Their photophysical studies were conducted.•Both the molecules…”
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Solution Processable Deep-Red Phosphorescent Pt(II) Complex: Direct Conversion from Its Pt(IV) Species via a Base-Promoted Reduction by Allison, Ilene, Lim, Hyunsoo, Shukla, Atul, Ahmad, Viqar, Hasan, Monirul, Deshmukh, Kedar, Wawrzinek, Robert, McGregor, Sarah K. M, Clegg, Jack K, Divya, Velayudhan V, Govind, Chinju, Suresh, Cherumuttathu H, Karunakaran, Venugopal, K. N, Narayanan Unni, Ajayaghosh, Ayyappanpillai, Namdas, Ebinazar B, Lo, Shih-Chun

“…Color purity is a critical prerequisite for full color displays. Creation of deep-red phosphorescent materials with high PLQYs is particularly challenging…”
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Aerogels of V2O5 nanowires reinforced by polyaniline for electromagnetic interference shielding by Puthiyedath Narayanan, Aparna, Narayanan Unni, K.N., Peethambharan Surendran, Kuzhichalil

“…[Display omitted] •Novel EMI shielding aerogel made of V2O5 nanowires, is reported for the first time.•Method of preparation involved a facile polymerisation…”
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Quick and reagent-free monitoring of edible oil saponification values using a handheld Raman device by Ajikumar, Nandu, Emmanuel, Neethu, Abraham, Bini, John, Annu, Pulparamban, Arif, Unni, K.N. Narayanan, Yoosaf, Karuvath

“…Saponification value, the average molecular weight of fatty acids, is a crucial parameter for detecting adulteration of edible oils. Conventionally, it is…”
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Improved efficiency in fluorescent blue organic light emitting diode with a carrier confining structure by Samal, Girija S., Narayanan Unni, K.N., Bharat, Saswat, Gupta, Shubham, Deepak

“…A blue organic light emitting device (OLED) with improved efficiency and good color purity is reported. The highest occupied molecular orbital (HOMO) level of…”
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Substituent-Controlled Photophysical Responses in Dihydropyridine Derivatives and Their Application in the Detection of Volatile Organic Contaminants by Kanneth, S. Shurooque, Mathew, Diana, Parameswaran, Pattiyil, Sajeev, Anjali K., Unni, K. N. Narayanan, Chakkumkumarath, Lakshmi

“…In the ever-expanding realm of organic fluorophores, structurally simple and synthetically straightforward molecules with unique photophysical properties have…”
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1,5‐Diazocine‐Based Diaryl Ketones: Design, Synthesis, and Optoelectronic Properties by Sebastian, Anjitha, Darshan, Vibhu, Nharangatt, Bijoy, Maka, Vijay Kumar, Linet, Amrutham, Achankunju, Simi, Nagaoka, Masaki, Yagi, Shigeyuki, Unni K. N., Narayanan, Neogi, Ishita

“…ABSTRACT Three novel heterocyclic host based on diaryl ketone‐tethered 1,5‐diazocines were designed and synthesized for applications in phosphorescent organic…”
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TPE-diphenylamine derivatives as solution-processable hole injectors with better charge balance for organic light-emitting diodes by Balakrishnan, Shibna, Prabhu, Pavithra V, Vipin, C K, Darshan, Vibhu, Unni, K N Narayanan, Joseph, Joshy

“…Charge injection and transport layers with optimum carrier transport properties are essential for stable and efficient organic light-emitting diode (OLED)…”
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