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Browsing by Author "Narayanan Unni, K N"

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

Rajeev, K; Vipin, C K; Sajeev, A K; Shukla, A; McGregor, S K M; Lo, S C; Namdas, E B; Narayanan Unni, K N (Springer, 2023-12-14)

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. ...
Design and Synthesis of Solution Processable Green Fluorescent D-π-A Dyads for OLED Applications

Shameel, T; Sanju, K S; Anjaly, S; Narayanan Unni, K N; Joshy Joseph; Ramaiah, D (Royal Society of Chemistry, 2018-02-24)

New solution processable organic donor–p–acceptor dyads 1 and 2 having electron donating phenoxazine and electron accepting oxadiazole groups have been synthesized. Intramolecular electron communication between the donor ...
Effect of the Electric Field During Annealing of Organic Light Emitting Diodes for Improving its on/off Ratio

Sharma, R K; Katiyar, M; Rao, I V K; Narayanan Unni, K N; Deepak (Royal Society of Chemistry, 2016)

If an organic light emitting diode is to be used as part of a matrix addressed array, it should exhibit low reverse leakage current. In this paper we present a method to improve the on/off ratio of such a diode by ...
Fine Tuning of Compact ZnO Blocking Layers for Enhanced Photovoltaic Performance in ZnO Based DSSCs: a Detailed Insight Using Beta Recombination, EIS, OCVD and IMVS Techniques

Swetha, S; Suraj Soman; Pradhan, S C; Narayanan Unni, K N; Peer Mohamed, A; Nair, B N; Hareesh, U S (Royal Society of Chemistry, 2017-12-15)

The electron–hole recombination and back electron flow at the conducting oxide–mesoporous film interface in dye-sensitized solar cells (DSSCs) are addressed primarily by the use of pre-blocking layers. Herein, the effects ...
Investigating mass transport and recombination as a function of structural variation in dye-sensitized solar cells employing indole fused heterocyclic organic sensitizers and cobalt electrolytes

Jayadev, V; Pradhan, S C; Nitha, P R; John, J; Narayanan Unni, K N; Soman, S (Elsevier, 2024-02)

Alternate cobalt redox mediator based dye-sensitized solar cells (DSCs) are getting widespread attention taking advantage of their one-electron transfer mechanism compared to the conventional iodide/triiodide electrolyte. ...
Low temperature-processed ZnO thin films for p–n junction-based visible-blind ultraviolet photodetectors

Hanna, B; Surendran, K P; Narayanan Unni, K N (Royal Society of Chemistry, 2018-11-06)

Ultraviolet (UV) photodetectors have drawn extensive attention due to their numerous applications in both civilian and military areas including flame detection, UV sterilization, aerospace UV monitoring, missile early ...
Photokinetic Study on Remarkable Excimer Phosphorescence from Heteroleptic Cyclometalated Platinum(II) Complexes Bearing a Benzoylated 2-Phenylpyridinate Ligand

Okamura, N; Maeda, T; Fujiwara, H; Anjaly, S; Narayanan Unni, K N; Ajayaghosh, A; Yagi, S (Royal Society of Chemistry, 2018-01-07)

Novel heteroleptic cyclometalated platinum(II) complexes consisting of 50-benzoylated 2-phenylpyridinate (ppy) cyclometalated and acetylacetonate ancillary ligands were synthesized, and their photoluminescence (PL) ...
Variation of the Donor and Acceptor in D–A–p–A Based Cyanopyridine Dyes and its Effect on Dye Sensitized Solar Cells

Hemavathi, B; Jayadev, V; Ramamurthy, P C; Pai, R K; Narayanan Unni, K N; Ahipa, T N; Soman, S; Balakrishna, R G (Royal Society of Chemistry, 2019-08-28)

Two metal free organic dyes (TPCTh and TPCRh) with D–A–π–A configuration, having 3-cyanopyridine as an auxiliary acceptor and thiophene π-linkers along with a triphenylamine donor and cyanoacetic acid/rhodanine-3-acetic ...

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