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Thermally Activated Delayed Fluorescence Host for High Performance Organic Light Emitting Diodes
Rajkamal Anand,김헌 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We investigate the dissociation mechanism of the C–N bond in the tris(4-carbazoyl-9-ylphenyl)amine (TCTA) which is a blended Thermally Activated Delayed Fluorescence host material in organic light-emitting diodes (OLEDs). The C–N bond dissociation energies, calculated at the density functional theory level, are found to depend strongly on the charge states of the parental molecules. In particular, the anionic C–N bond dissociations resulting low dissociation energies. These low values are attributed to the large electron affinity, a feature that importantly can be modulated via substitution. The implications of this result must be considered when designing blue OLED hosts since these materials must combine chemical stability and high triplet energy.
Rajkamal Vishnu,Guruprasad D. Rai,Ganesh Sevagur Kamath,Vijaya Kumara 대한흉부외과학회 2021 Journal of Chest Surgery (J Chest Surg) Vol.54 No.2
Background: Refractory empyemas with collapsed lung and persistent bronchopleural fistulas pose significant problems to thoracic surgeons and impose a substantial burden in terms of morbidity and mortality. The modified Eloesser flap procedure is a useful palli- ative option for clearing infections. Herein, we present our experiences with the modified Eloesser flap procedure in mixed suppurative lung pathologies with a new technique of irrigation for persistent infection. Methods: A retrospective review was carried out of 56 patients who underwent the modified Eloesser flap with continuous irrigation at Katurba Medical College. These pa- tients had severe morbidities and were not suitable for major thoracic resection surgery, and electively underwent modified Eloesser flap surgery. Regular follow-up was done at 1, 3, 6, and 12 months. Patients with persistent infections were treated with our continuous irrigation technique. Results: The most important finding was that all patients with active sputum acid-fast bacilli–positive findings became sputum smear–negative during the first month of fol- low-up. Half (50%) of the patients had a patent stoma. Eleven patients had persistent infec- tions, necessitating continuous irrigation. The infection was fully cleared after 1 month in 9 patients, while 2 patients required second irrigation and continued to receive follow-up. In the remaining 50% of the patients, the stoma closed completely, and the lung expanded fully. Conclusion: The modified Eloesser flap is a simple procedure. In suppurative patholo- gies, infections were well controlled and the general condition of the patients improved. Our continuous irrigation method showed promising results in patients with persistent purulent discharge.
Rakesh K. Sonker,Rajkamal Shastri,B.C. Yadav 장전수학회 2019 Proceedings of the Jangjeon mathematical society Vol.22 No.1
Conducting polymers have been concerned the ample interest of scientific community due to its special physical and chemical properties. Among this group of materials, the Polyaniline (PANI) merits special attention due to its high thermal and chemical stability under normal conditions, simple process of polymerization low cost and well-studied electrochemical characteristics. In the present work, Density functional theory (DFT) method has been applied for geometry optimization using B3LYP/6-31G** basis set, implemented on Gaussian 09 software package. The well-known model, time-dependent DFT (TDDFT) calculations at the UB3LYP/6-31G(d) level have been performed to investigate the tunable nature, i.e., doping processes, of polyaniline (PANI). The calculated theoretical data show strong correlation with the recent experimental reports, which validates our computational protocol. The calculated properties are extrapolated to the polymer (PANI) through a second-order polynomial fit. Changes in band gap, conductivity, and resistance of (PANI_n) and (PANI_n) (where n = 1-4 and) were studied. Further we have also synthesized and characterized the Polyaniline. The deviations in the obtained results have clearly shown the promising of Polyaniline as a quantity sensitive material that may be useful for the sensing application.
Ruchi Malik,Manisha Mukherjee,Aditya Swami,Dilip S. Ramteke,Rajkamal Sarin 한국탄소학회 2004 Carbon Letters Vol.5 No.2
The studies on activated carbon prepared from walnut shell and groundnut shell were undertaken to ascertain the effect of initial state of precursor and activation process on the development of porosity in the resulting activated carbon. Walnut shell based carbon shows the presence of cellular pores while Groundnut shell based carbon shows fibrillar pore structure. The adsorption parameters, characterization of product and scanning electron microscopic studies carried out showed the presence of mainly Micro, Meso and Macro porosity in carbon prepared from Walnut shell while mainly micro porosity was observed in Groundnut shell based activated carbon. An interrelationship between the adsorption efficiency and porosity in terms of quality control parameters, for before and after activation, was validated through the scanning electron microscopic data.
Malik, Ruchi,Mukherjee, Manisha,Swami, Aditya,Ramteke, Dilip S.,Sarin, Rajkamal Korean Carbon Society 2004 Carbon Letters Vol.5 No.2
The studies on activated carbon prepared from walnut shell and groundnut shell were undertaken to ascertain the effect of initial state of precursor and activation process on the development of porosity in the resulting activated carbon. Walnut shell based carbon shows the presence of cellular pores while Groundnut shell based carbon shows fibrillar pore structure. The adsorption parameters, characterization of product and scanning electron microscopic studies carried out showed the presence of mainly Micro, Meso and Macro porosity in carbon prepared from Walnut shell while mainly micro porosity was observed in Groundnut shell based activated carbon. An interrelationship between the adsorption efficiency and porosity in terms of quality control parameters, for before and after activation, was validated through the scanning electron microscopic data.
Raj Kamal,Piyush Chandravanshi,최덕균,Santosh M. Bobade 한국물리학회 2015 Current Applied Physics Vol.15 No.5
In this investigation, the carrier concentration gradient between channel and contact region is achieved to improve the Thin film Transistors (TFT) performance by employing annealing at 350 ℃ in forming gas (N2 + 5% H2). The contact region is covered with Mo metal and the channel region is only exposed to forming gas to facilitate the diffusion controlled reaction. The TFT using a-IGZO active layer is fabricated in ambient of Ar:O2 in ratio 60:40 and the conductivity of the order of 10-3 S/cm is measured for asdeposited sample. The electrical conductivity of an annealed sample is of the order of 102 S/cm. The device performance is determined by measuring merit factors of TFT. The saturation mobility of magnitude 18.5 cm2V-1 s-1 has been determined for W/L (20/10) device at 15 V drain bias. The extrapolated field effect mobility for a device with channel width (W) 10 mm is 19.3 cm2V-1 s-1. The on/ off current ratio is 109 and threshold voltage is in the range between 2 and 3 V. The role of annealing on the electronic property of a-IGZO is carried out using X-ray photoelectron spectroscopy (XPS). The valance band cut-off has been approximately shifted to higher binding energy by 1 eV relative to asdeposited sample.