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Saint Petersburg, Russia

Ivukin I.N.,University of Information Technologies | Bougrov V.E.,University of Information Technologies | Kovsh A.R.,University of Information Technologies | Odnoblyudov M.A.,Optogan Group | And 2 more authors.
Materials Physics and Mechanics | Year: 2013

Aims of this work were research of the material transfer properties influence on heat transfer and subsequent search of the heat dissipation optimization ways. Subject of the research was plastic heat sinks for retrofit LED lamps. To achieve this aims numerical simulations of free convection flow were performed which were coupled with simulation inside solid parts of the heat sink. In this study, parametrical researches took place. During this study, heat transport properties of the heat sink material were varied. Derived results allowed to make conclusion about optimal heat transport properties of the plastics which can be used in retrofit LED lamp production. In addition, some heat sink structure improvements were proposed. © 2013, Institute of Problems of Mechanical Engineering. Source


Suslov S.S.,Optogan Group | Vinogradova K.A.,RAS Ioffe Physical - Technical Institute | Bougrov V.E.,Optogan Group | Odnoblyudov M.A.,Optogan Group | Romanov A.E.,Optogan Group
Materials Physics and Mechanics | Year: 2012

We consider the task of parametric optimization of the properties for nitride semiconductor light emitting chip. The solution is given in the framework of the selfconsistent electrical/thermal/optical approach. Dependences of radiation power, chip wall plug efficiency (WPE) and current spreading are presented for varying geometry of chip electrodes. The optimization procedure predicts more than 8% increase in WPE. Original software based on finite volume and ray tracing analysis was used in simulation. © 2012, Institute of Problems of Mechanical Engineering. Source


Ivukin I.N.,St Petersburg National Research University Of Information Technologies | Artem'ev D.M.,St Petersburg National Research University Of Information Technologies | Bugrov V.E.,St Petersburg National Research University Of Information Technologies | Odnoblyudov M.A.,Optogan Group | Romanov A.E.,RAS Ioffe Physical - Technical Institute
Physics of the Solid State | Year: 2012

The stress-strain state in thin structured gallium nitride films on sapphire substrates containing open pores has been simulated. The results have been obtained by the finite element method in the commercial program complex. The stress intensity factor KI has been calculated for the model considering a crack at the GaN/sapphire interface near an open pore. Based on the calculations of elastic fields, the redistribution of stresses by a structure with an ordered array of open pores in gallium nitride films has been estimated. © 2012 Pleiades Publishing, Ltd. Source


Shvaleva M.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Nikulina L.A.,Optogan Group | Aseev V.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Mynbaev K.D.,RAS Ioffe Physical - Technical Institute | And 5 more authors.
Optical Review | Year: 2014

New types of phosphor (YAG:Ce3+: yttrium-aluminum garnet doped with Ce3+ ions) containing glass-ceramics material was developed for light-emitting diodes (LEDs). The optical properties of the experimental samples were investigated and are reported on. Use of new phosphor material in white LEDs fabricated with the “chip-on-board” technology is demonstrated. © 2014, The Optical Society of Japan. Source


Lipnitskaya S.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Mynbaev K.,RAS Ioffe Physical - Technical Institute | Nikulina L.,Optogan Group | Kramnik V.,Optogan Group | And 4 more authors.
Optical Review | Year: 2014

A research has been carried out on the optimization of the shape of encapsulating cover to minimize optical losses in light-emitting modules fabricated with the “chip-on-board” (COB) technology. Optical properties of the components of a typical COB were taken into account including those of the substrate, light-emitting chips, encapsulating material and phosphor particles. Light losses were analyzed for various types of encapsulant surface structuring in an attempt to design an optical element with maximum light extraction efficiency. Calculations were complemented with experimental measurements. The results of the research showed that structuring the surface of the encapsulant can enhance light extraction by 10 to 15% for the material without phosphor particles and by 10 to 14% for the material with phosphor particles. © 2014, The Optical Society of Japan. Source

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