@inbook{MTMT:2810732,
	title = {Foglalatba illeszthető LED modulok hűtő szerelvényeinek termikus vizsgálata},
	url = {https://m2.mtmt.hu/api/publication/2810732},
	author = {Poppe, András and Kollár, Ernő and Tóth, Zoltán and Simonovics, János},
	booktitle = {Világítástechnikai Évkönyv 2014-2015},
	unique-id = {2810732},
	abstract = {A foglalatba illeszthető LED modulok fejlesztése felkeltette 
		az 
		igényt az ilyen modulok hűtésére szolgáló hűtőszerelvények, 
		hűtőbordák termikus minősítése iránt. E feladat kapcsán a 
		gyártók természetes próbálkozása, az alkatrész szintű LED 
		termikus mérési szabványoknak egy teljes LED modul + 
		hűtőszerelvény rendszerre történő alkalmazása lehet, de ekkor 
		ismerni kell az alkalmazott LED-ek teljes kisugárzott optikai 
		teljesítményét. Annak érdekében, hogy ne kelljen ezt 
		meghatározni, a hűtőszerelvények termikus minősítő mérései 
		során 
		célszerű a LED modulokat termikus viselkedésük szempontjából 
		jól 
		képviselő, termikus helyettesítő modult használni, amelyben 
		LED-
		ek helyett pl. szilícium diódák vagy tranzisztorok a 
		hőforrások. 
		Jelen írásunkban egy ilyen ún. termikus dummy modult mutatunk 
		be, majd ismertetjük az ezen modul segítségével végzett 
		mérések 
		eredményeit, és azt a módszert, amelynek a segítségével a 
		mérési 
		eredményekből megállapítható a hűtőbordák hőellenállása.},
	year = {2015},
	pages = {98-103},
	orcid-numbers = {Poppe, András/0000-0002-9381-6716}
}

@mastersthesis{MTMT:2862742,
	title = {Termikus kérdések az elektronikában: mérés, modellezés, speciális eszközök},
	url = {https://m2.mtmt.hu/api/publication/2862742},
	author = {Kollár, Ernő},
	unique-id = {2862742},
	year = {2014}
}

@inproceedings{MTMT:2699430,
	title = {Characterization of heat-sinks of socketable LED modules using thermal transient testing},
	url = {https://m2.mtmt.hu/api/publication/2699430},
	author = {Poppe, András and Kollár, Ernő and Toth, Z and Simonovics, János},
	booktitle = {20th International Workshop on THERMal INvestigation of ICs and Systems (THERMINIC'14)},
	doi = {10.1109/THERMINIC.2014.6972497},
	unique-id = {2699430},
	abstract = {As socketable LED modules are being developed the need for 
		thermal characterization of heat-sinks aimed at cooling such 
		modules has also arisen. The natural approach from manufacturers is to apply the component level LED thermal testing standards to characterize complete LED module and heat-sink systems. In order to obtain the real thermal resistance of such a complete assembly needs the consideration of the radiant power of the LEDs when calculating the thermal resistance of the complete assembly. Also, the contribution of the LED module, the thermal interface between the module and the heat-sink and the thermal resistance of the heat-sink need to be separated. For the latter problem thermal transient measurements followed by structure function analysis is a solution. To eliminate the need for the measurement of radiant flux of the LED module we suggest building a thermal dummy of the module in question which mechanically is compatible with the module but the heat source is a conventional silicon device instead of LEDs. The paper provides details how such a thermal dummy was created and used in characterizing different heat-sinks aimed at a particular LED module family.},
	year = {2014},
	orcid-numbers = {Poppe, András/0000-0002-9381-6716}
}

@article{MTMT:2662740,
	title = {Nonlinear electro-thermal and light output modeling and simulation of OLEDs},
	url = {https://m2.mtmt.hu/api/publication/2662740},
	author = {Kollár, Ernő and Pohl, László and Poppe, András and Kohári, Zsolt},
	doi = {10.3311/PPee.7477},
	journal-iso = {PERIOD POLYTECH ELECTR ENG COMP SCI},
	journal = {PERIODICA POLYTECHNICA-ELECTRICAL ENGINEERING AND COMPUTER SCIENCE},
	volume = {58},
	unique-id = {2662740},
	issn = {2064-5260},
	abstract = {Lighting application of Organic Light Emitting Diodes (OLEDs) has been forecasted and such applications appear already in the high end segment of the market. These devices should provide homogeneous luminance – homogeneity is one of the quality metrics of such devices. Local light generation depends on both the local temperature and the local voltage drop across the light emitting polymer(s) in the device. Due to the large area of these devices the coupled optical, electrical and thermal simulation problem is of distributed nature. Electrical characteristics of organic semiconductor materials used in OLED devices are nonlinear, and their nonlinear temperature-dependence is significant. Measurement and temperature-dependent electrical and optical modeling of OLEDs is presented in this study. The paper addresses the special needs of OLEDs in distributed electro-thermal field simulation. These needs are not handled appropriately yet in the widely used, commercially available simulation tools. However the latest version of our SUNRED field solver algorithm is capable of handling these coupled, non-linear optical-electrical-thermal problems. The new features of the algorithm are demonstrated by modeling some research OLED samples available to us in the Fast2Light project – this way simulation results are compared against measured data. The results suggest that the models and the simulation tool can be used well  in OLED design.},
	year = {2014},
	eissn = {2064-5279},
	pages = {43-53},
	orcid-numbers = {Pohl, László/0000-0003-2390-1381; Poppe, András/0000-0002-9381-6716; Kohári, Zsolt/0000-0002-9908-6291}
}

@article{MTMT:2683473,
	title = {Nonlinear electro-thermal modeling and field-simulation of OLEDs for lighting applications II: Luminosity and failure analysis},
	url = {https://m2.mtmt.hu/api/publication/2683473},
	author = {Kohári, Zsolt and Kollár, Ernő and Pohl, László and Poppe, András},
	doi = {10.1016/j.mejo.2012.05.015},
	journal-iso = {MICROELECTRON J},
	journal = {MICROELECTRONICS JOURNAL},
	volume = {44},
	unique-id = {2683473},
	issn = {0026-2692},
	year = {2013},
	eissn = {0959-8324},
	pages = {1011-1018},
	orcid-numbers = {Kohári, Zsolt/0000-0002-9908-6291; Pohl, László/0000-0003-2390-1381; Poppe, András/0000-0002-9381-6716}
}

@article{MTMT:2662739,
	title = {Nonlinear electro-thermal modeling and field-simulation of OLEDs for lighting applications I: Algorithmic fundamentals},
	url = {https://m2.mtmt.hu/api/publication/2662739},
	author = {Pohl, László and Kollár, Ernő and Poppe, András and Kohári, Zsolt},
	doi = {10.1016/j.mejo.2011.06.011},
	journal-iso = {MICROELECTRON J},
	journal = {MICROELECTRONICS JOURNAL},
	volume = {43},
	unique-id = {2662739},
	issn = {0026-2692},
	abstract = {Large area OLEDs aimed at lighting applications should provide homogeneous luminance—homogeneity is one of the quality metrics of such devices. Local light generation depends on both the local temperature and the local voltage drop across the light emitting polymer(s) in the device. Therefore the thermal and electrical engineering of OLEDs aimed at lighting applications is critical. Due to the large area of these devices the coupled electrical and the thermal simulation problem is of distributed nature. Electrical characteristics of organic semiconductor materials used in OLED devices are highly nonlinear, and their nonlinear temperature-dependence is significant. In our present approach to distributed electro-thermal field simulation we address special needs of OLEDs, which is not yet the case with widely used, commercially available simulation tools. In this paper we present the latest version of our SUNRED electro-thermal field solver algorithm capable of handling coupled, non-linear electro-thermal problems. The new features of the algorithm are demonstrated by modeling some research OLED samples available to us in the Fast2Light project—this way simulation results are compared against measured data.},
	keywords = {Electro-thermal simulation; finite difference methods; OLED},
	year = {2012},
	eissn = {0959-8324},
	pages = {624-632},
	orcid-numbers = {Pohl, László/0000-0003-2390-1381; Poppe, András/0000-0002-9381-6716; Kohári, Zsolt/0000-0002-9908-6291}
}

@inproceedings{MTMT:2668689,
	title = {Extension of the SUNRED algorithm for electro-thermal simulation and its application in failure analysis of large area (organic) semiconductor devices},
	url = {https://m2.mtmt.hu/api/publication/2668689},
	author = {Pohl, László and Kollár, Ernő},
	booktitle = {Proceedings of the 17th International Workshop on THERMal INvestigation of ICs and Systems (THERMINIC'11)},
	unique-id = {2668689},
	year = {2011},
	pages = {195-200},
	orcid-numbers = {Pohl, László/0000-0003-2390-1381}
}

@article{MTMT:2662802,
	title = {Thermal behavior of acousto-optic devices: effects of ultrasound absorption and transducer losses.},
	url = {https://m2.mtmt.hu/api/publication/2662802},
	author = {Maák, Pál and Takacs, T and Barócsi, Attila and Kollár, Ernő and Richter, Péter},
	doi = {10.1016/j.ultras.2010.11.010},
	journal-iso = {ULTRASONICS},
	journal = {ULTRASONICS},
	volume = {51},
	unique-id = {2662802},
	issn = {0041-624X},
	abstract = {In the present paper we analyze the electric and acoustic losses in acousto-optic devices, especially in their ultrasonic transducers and the related thermal effects. We include electric and acoustic losses into the classical electric equivalent model of the transducer, to explain the characteristics of the measured electric and thermal behavior. Measured temperature distributions on the acousto-optic crystal faces serve visualization of the conversion efficiency of the radio-frequency input to bulk acoustic waves. We show that the pronounced acoustic frequency dependence of the temperature distribution is in correlation with the frequency dependent losses in the transducer and in the bulk. We also demonstrate experimentally the effectiveness of our active and passive heat removing and temperature stabilization methods.},
	year = {2011},
	eissn = {1874-9968},
	pages = {441-451},
	orcid-numbers = {Barócsi, Attila/0000-0002-8986-1346}
}

@article{MTMT:2662204,
	title = {Statikus TIM teszter tervezése},
	url = {https://m2.mtmt.hu/api/publication/2662204},
	author = {Székely, Vladimir and Kollár, Ernő and Somlay, Gergely László and Szabó, Péter Gábor and Juhász, László and Kerecsen Istvánné Rencz, Márta and Vass-Várnai, András},
	journal-iso = {HIRADÁSTECHNIKA},
	journal = {HIRADÁSTECHNIKA (1962)},
	volume = {66},
	unique-id = {2662204},
	issn = {0018-2028},
	year = {2011},
	pages = {37-47},
	orcid-numbers = {Szabó, Péter Gábor/0000-0001-7601-743X; Kerecsen Istvánné Rencz, Márta/0000-0003-4183-3853}
}

@inproceedings{MTMT:2655966,
	title = {Nonlinear electro-thermal OLED model in SUNRED field simulator},
	url = {https://m2.mtmt.hu/api/publication/2655966},
	author = {Pohl, László and Kollár, Ernő and Poppe, András},
	booktitle = {Proceedings of the 16th International Workshop on THERMal INvestigation of ICs and Systems (THERMINIC'10)},
	unique-id = {2655966},
	abstract = {Lighting purpose organic light-emitting devices
		have to be answer to high electrical and thermal requirements.
		Design of these devices needs special engineering. The electrical current and dissipated power distribution in an OLED needs electro-thermal field simulation. The algorithm in our simulation tool, SUNRED, had to be extended to be able to handle
		highly nonlinear electrical OLED characteristics, and nonlinear
		temperature dependence. We have created an electro-thermal
		model for the OLED samples given by our project partner. The
		nonlinear semiconductor junction model is applied in
		SUNRED. This article surveys the new OLED model and
		presents the application in electro-thermal simulations. Finally
		we compare the measurement, model and simulation results.},
	year = {2010},
	pages = {149-153},
	orcid-numbers = {Pohl, László/0000-0003-2390-1381; Poppe, András/0000-0002-9381-6716}
}