Browsing by Author "Cengiz, Ceren"
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Discrete phase analysis of self heating particles over an immersion liquid cooled high power blue light-emitting diode with suspended phosphor particles
Cengiz, Ceren; Muslu, Ahmet Mete; Azarifar, Mohammad; Arık, Mehmet; Dogruoz, B. (ASME, 2022-10)In recent years, the interaction of unrestricted particles with dispersed multiphase flows has been linked to a number of important engineering applications. Among these applications, the novel idea of immersion-cooled ... -
Dynamic opto-electro-thermal characterization of solid state lighting devices: measuring the power conversion efficiency at high current densities
Azarifar, Mohammad; Cengiz, Ceren; Arık, Mehmet (IOP Publishing, 2022-09-22)Solid state lighting devices with high power densities require accurate characterization, as the rise of chip temperature impacts its optical, electrical, and lifetime characteristics. A detailed experimental study is ... -
Enhanced thermal performance of high flux led systems with two-phase immersion cooling
Cengiz, Ceren; Muslu, Ahmet Mete; Arık, Mehmet; Doğruöz, B. (IEEE, 2020)Considering significant worldwide use of electricity for general lighting, the implementation of energy efficient technologies is highlighted in many platforms with the use of light emitting diodes (LEDs). Because of its ... -
An experimental and numerical investigation of immersion cooled blue led combined with yag:ce phosphor for thermal, electrical and optical performance
At the new age of illumination, light emitting diodes (LEDs) have been proven to be the most efficient alternative to conventional light sources. Yet, in comparison to the other lighting systems, LEDs can withstand a lower ... -
High brightness illumination based on laser light diffusion with mie scattering
Azarifar, Mohammad; Cengiz, Ceren; Ocaksönmez, Kerem; Onal, A.; Nizamoglu, S.; Arık, Mehmet (ASME, 2022)Limited luminous flux per wafer area of light emitting diodes (LEDs) for high power solid state illumination causes some packaging real estate issues. This problem can be tackled with laser diodes (LDs). At high current ... -
Machine learning to predict junction temperature based on optical characteristics in solid-state lighting devices: A test on WLEDs
Azarifar, Mohammad; Ocaksönmez, Kerem; Cengiz, Ceren; Aydoğan, Reyhan; Arık, Mehmet (MDPI, 2022-08)While junction temperature control is an indispensable part of having reliable solid-state lighting, there is no direct method to measure its quantity. Among various methods, temperature-sensitive optical parameter-based ... -
Optical and thermal analysis of secondary optics in light emitting diodes' packaging: Analysis of MR16 lamp
Azarifar, Mohammad; Cengiz, Ceren; Arık, Mehmet (IOP Publishing, 2021-12-08)Optical and thermal control are two main factors in package design process of lighting products, specifically light emitting diodes (LEDs). This research is aimed to study the role of secondary optics in opto-thermal ... -
Particle based investigation of self-heating effect of phosphor particles in phosphor converted light emitting diodes
Azarifar, Mohammad; Cengiz, Ceren; Arık, Mehmet (Elsevier, 2021-03)Since 2003, self-heating effect of phosphor which reduces the efficacy and reliability of phosphor conversion (Pc) light emitting diodes (LEDs), has been a growing research area of opto-thermal Pc-LED modeling. However, ... -
Thermal and optical characterization of white and blue multi-chip LED light engines
Cengiz, Ceren; Azarifar, Mohammad; Arık, Mehmet (IEEE, 2021)A clear understanding of thermal characteristics for light emitting diodes (LEDs) is at the center of attention for lighting industry. Especially accurate evaluation of the junction temperature of various light engines is ... -
Thermal and optical performance characterization of bare and phosphor converted LEDs through package level immersion cooling
Azarifar, Mohammad; Cengiz, Ceren; Arık, Mehmet (Elsevier, 2022-06-15)Increased demand for high flux electronics requires creative and affordable thermal management approaches to meet the performance and lifetime expectations. In the present study, optical and thermal improvements of a new ...
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