Trinh, Quang Vinh (2013)
Characterization, optimization and stabilization of the lighting quality aspects of high qualitative hybrid LED-lamps by development of transient LED models.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
Since the year 1996, when NAKAMURA demonstrated his first InGaN blue LEDs that can be combined with luminescent materials to create high brightness phosphor converted LEDs (PC-LEDs), the third revolution of lighting with LEDs had begun officially. Nowadays, the luminous efficacy of some cold white PC-LEDs can achieve a value of about 140 lm/W. Moreover, by an appropriate combination of color semiconductor LEDs and white PC-LEDs in hybrid LED-lamps, their spectra can be controlled dynamically. However, unfortunately the optical, radiant and colorimetric properties of LEDs vary strongly according to their forward current and their operating temperature. Consequently, it will be impossible to manufacture good and stable quality solid state luminaries, as well to optimize and stabilize their spectra, if LED properties are not characterized appropriately by transient LED models. Therefore, in this thesis the variation of LED properties must be investigated practically and the intrinsic physical and chemical phenomena taking place inside LEDs must be studied entirely. Hence, the difficulties in the applying, control and operation of LEDs will also be recognized. As well, the accurate characterization of the properties of LEDs by the development of the transient LED models will be carried out. Then, these transient LED models will be applied to the optimization and stabilization of the lighting quality aspects of high qualitative hybrid LED-lamps adapted to the colored surface objects. In that, an available LED combination with optimized / stabilized algorithms in the microcontrollers of hybrid LED-lamps will make the solid state luminaries achieve the high and stable lighting quality with the high luminous efficacy and the optimal spectra possible. In addition, color objects in the lighting application must also be identified specifically by their spectral reflectance distributions. As a result, the adaptive and optimal control factors will create the high qualitative hybrid LED-lamps that can satisfy the lighting demand of the color objects. Finally, high quality solid state lighting systems with these hybrid LED-lamps are the main aim of the thesis.
| Typ des Eintrags: | Dissertation | ||||
|---|---|---|---|---|---|
| Erschienen: | 2013 | ||||
| Autor(en): | Trinh, Quang Vinh | ||||
| Art des Eintrags: | Erstveröffentlichung | ||||
| Titel: | Characterization, optimization and stabilization of the lighting quality aspects of high qualitative hybrid LED-lamps by development of transient LED models | ||||
| Sprache: | Englisch | ||||
| Referenten: | Tran, Prof. Quoc Khanh ; Elsäßer, Prof. Wolfgang Erich | ||||
| Publikationsjahr: | 20 September 2013 | ||||
| Ort: | Darmstadt - Germany | ||||
| Datum der mündlichen Prüfung: | 10 September 2013 | ||||
| URL / URN: | http://tuprints.ulb.tu-darmstadt.de/3618 | ||||
| Kurzbeschreibung (Abstract): | Since the year 1996, when NAKAMURA demonstrated his first InGaN blue LEDs that can be combined with luminescent materials to create high brightness phosphor converted LEDs (PC-LEDs), the third revolution of lighting with LEDs had begun officially. Nowadays, the luminous efficacy of some cold white PC-LEDs can achieve a value of about 140 lm/W. Moreover, by an appropriate combination of color semiconductor LEDs and white PC-LEDs in hybrid LED-lamps, their spectra can be controlled dynamically. However, unfortunately the optical, radiant and colorimetric properties of LEDs vary strongly according to their forward current and their operating temperature. Consequently, it will be impossible to manufacture good and stable quality solid state luminaries, as well to optimize and stabilize their spectra, if LED properties are not characterized appropriately by transient LED models. Therefore, in this thesis the variation of LED properties must be investigated practically and the intrinsic physical and chemical phenomena taking place inside LEDs must be studied entirely. Hence, the difficulties in the applying, control and operation of LEDs will also be recognized. As well, the accurate characterization of the properties of LEDs by the development of the transient LED models will be carried out. Then, these transient LED models will be applied to the optimization and stabilization of the lighting quality aspects of high qualitative hybrid LED-lamps adapted to the colored surface objects. In that, an available LED combination with optimized / stabilized algorithms in the microcontrollers of hybrid LED-lamps will make the solid state luminaries achieve the high and stable lighting quality with the high luminous efficacy and the optimal spectra possible. In addition, color objects in the lighting application must also be identified specifically by their spectral reflectance distributions. As a result, the adaptive and optimal control factors will create the high qualitative hybrid LED-lamps that can satisfy the lighting demand of the color objects. Finally, high quality solid state lighting systems with these hybrid LED-lamps are the main aim of the thesis. |
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| Freie Schlagworte: | LED-Model, Hybrid LED-lamp, vertical LED-model | ||||
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| URN: | urn:nbn:de:tuda-tuprints-36189 | ||||
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau 600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie 600 Technik, Medizin, angewandte Wissenschaften > 670 Industrielle und handwerkliche Fertigung |
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| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektromechanische Konstruktionen (aufgelöst 18.12.2018) 18 Fachbereich Elektrotechnik und Informationstechnik > Lichttechnik (ab Okt. 2021 umbenannt in "Adaptive Lichttechnische Systeme und Visuelle Verarbeitung") |
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| Hinterlegungsdatum: | 06 Okt 2013 19:55 | ||||
| Letzte Änderung: | 26 Aug 2022 09:57 | ||||
| PPN: | |||||
| Referenten: | Tran, Prof. Quoc Khanh ; Elsäßer, Prof. Wolfgang Erich | ||||
| Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 10 September 2013 | ||||
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