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.
Darmstadt - Germany, TU Darmstadt, [Online-Edition: http://tuprints.ulb.tu-darmstadt.de/3618],
[Ph.D. Thesis]
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.
| Item Type: |
Ph.D. Thesis
|
| Erschienen: |
2013 |
| Creators: |
Trinh, Quang Vinh |
| Title: |
Characterization, optimization and stabilization of the lighting quality aspects of high qualitative hybrid LED-lamps by development of transient LED models |
| Language: |
English |
| 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. |
| Place of Publication: |
Darmstadt - Germany |
| Uncontrolled Keywords: |
LED-Model, Hybrid LED-lamp, vertical LED-model |
| Divisions: |
18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Light Technology |
| Date Deposited: |
06 Oct 2013 19:55 |
| Official URL: |
http://tuprints.ulb.tu-darmstadt.de/3618 |
| URN: |
urn:nbn:de:tuda-tuprints-36189 |
| Referees: |
Tran, Prof. Quoc Khanh and Elsäßer, Prof. Wolfgang Erich |
| Refereed / Verteidigung / mdl. Prüfung: |
10 September 2013 |
| Alternative keywords: |
| Alternative keywords | Language |
|---|
| LED-Modell, Hybrid LED-Lichtquelle, vertikales LED-Modell | German |
|
| Alternative Abstract: |
| Alternative abstract | Language |
|---|
| Seit 1996, als NAKAMURA seine ersten InGaN blauen LEDs demonstrierte, die mit lumineszierenden Materialien kombiniert werden können, um die weißen leuchtstoff-basierten Hochleistungs-LEDs (PC-LEDs) herzustellen, begann die dritte weltweite Revolution der Beleuchtung mit LEDs. Derzeit kann die Lichtausbeute von kaltweißen PC-LEDs einen Wert von etwa 140 lm/W erreichen. Außerdem können ihre Spektren dynamisch durch eine geeignete Kombination von farbigen LEDs und weißen PC-LEDs in hybriden LED-Lampen gesteuert werden. Doch variieren die optischen, lichttechnischen und farbtechnischen Eigenschaften der LEDs stark mit ihren Strömen und Betriebstemperaturen. Folglich wird es unmöglich, gute und stabile Halbleiter-Lichtquellen herzustellen sowie ihre Spektren zu optimieren und zeitlich zu stabilisieren, wenn die LED-Eigenschaften nicht vorher angemessen durch transiente LED Modelle charakterisiert wurden.
Deshalb müssen die Variationen der LED-Eigenschaften praktisch in dieser Arbeit untersucht werden und die intrinsischen physikalischen und chemischen Phänomene der LEDs vollständig studiert werden. Dadurch werden die Schwierigkeiten bei der Anwendung, Steuerung und Bedienung der LEDs auch erkannt. Auch wird die genaue Charakterisierung der Eigenschaften von LEDs durch Entwicklung der transienten LED-Modelle durchgeführt werden. Dann werden diese transienten LED-Modelle zur Optimierung und Stabilisierung der Lichtqualität-Aspekte der qualitativen hybriden LED-Lampen angewendet werden, um die Farbobjekte anzupassen. Dies führt zu einem Aufbau einer LED-Kombination mit optimierten / stabilisierten Algorithmen in den Mikrokontrollern hybrider LED-Lampen bezüglich hoher und stabiler Lichtqualität, die eine hohe Lichtausbeute und optimale Spektren aufweisen. Zusätzlich müssen die farbigen Oberflächenobjekte in den Beleuchtungsanwendungen speziell durch ihre spektralen Reflexionsgrade betrachtet werden. Folglich werden die adaptiven und optimalen Einstellungsfaktoren für die LED-Lichtquellen hergeleitet, so dass die LED-Lichtquellen die Anforderungen bezüglich hoher Farbqualität der Beleuchtung vorher definierter Farbobjekte erfüllen können. Die theoretische und praktische Auslegung hochwertiger Halbleiter-Beleuchtungssysteme mit hybriden LED-Lampen bildet das Hauptziel dieser Arbeit. | German |
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