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Lee, J.S.,Arunkumar, P.,Kim, S.,Lee, I.J.,Lee, H.,Im, W.B. OPTICAL SOCIETY OF AMERICA 2014 Optics letters Vol.39 No.4
The white light-emitting diode (WLED) is a state-of-the-art solid state technology, which has replaced conventional lighting systems due to its reduced energy consumption, its reliability, and long life. However, the WLED presents acute challenges in device engineering, due to its lack of color purity, efficacy, and thermal stability of the lighting devices. The prime cause for inadequacies in color purity and luminous efficiency is the spectral overlapping of red components with yellow/green emissions when generating white light by pumping a blue InGaN chip with yellow YAG:Ce3+ phosphor, where red phosphor is included, to compensate for deficiencies in the red region. An innovative strategy was formulated to resolve this spectral overlapping by alternatively arranging phosphor-in-glass (PiG) through cutting and reassembling the commercial red CaAlSiN3:Eu2+ and green Lu3Al5O12:Ce3+ PiG. PiGs were fabricated using glass frits with a low softening temperature of 600 degrees C, which exhibited excellent thermal stability and high transparency, improving life time even at an operating temperature of 200 degrees C. This strategy overcomes the spectral overlapping issue more efficiently than the randomly mixed and patented stacking design of multiple phosphors for a remote-type WLED. The protocol for the current design of PiG possesses excellent thermal and chemical stability with high luminous efficiency and color purity is an attempt to make smarter solid state lighting for high-powered remote-type white light-emitting devices. (C) 2014 Optical Society of America
A. J. Jegadeesan,L. Karunamoorthy,N. Arunkumar 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
Hot staking is the preferred process for conductor-commutator joints in the DC motor armatures as it is versatile and cost effective. Buthowever its application is limited by the peak failure load of the joint which depends only on the mechanical contact as there is no amalgamationor diffusion of metals in the faying surface. This study investigates the mechanical joint strength and found its variation has apositional pattern which is significantly related to similar pattern in electrode heat. A hypothesis for the similarity is reasoned and validated,which enabled evolution of a feasible solution to have differential input of energy compensating the variation in heat. This resultedin overcoming the limitation of joint strength in introduction of hot staked armatures to new applications. The use of Shainin clue generatingtool, Relations diagram and visualizing the physical mechanism complemented the problem solving approach in causal clue exploration,hypothesis reasoning and solution development.