Details
| Original language | English |
|---|---|
| Title of host publication | Physics and Simulation of Optoelectronic Devices XXVIII |
| Editors | Bernd Witzigmann, Marek Osinski, Yasuhiko Arakawa |
| Publisher | SPIE |
| ISBN (electronic) | 9781510633117 |
| Publication status | Published - 2 Mar 2020 |
| Event | Physics and Simulation of Optoelectronic Devices XXVIII 2020 - San Francisco, United States Duration: 3 Feb 2020 → 6 Feb 2020 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 11274 |
| ISSN (Print) | 0277-786X |
| ISSN (electronic) | 1996-756X |
Abstract
Solid-state white light sources gain increasing interest due to their advanced characteristics compared to conventional lighting solutions. New design challenges are introduced in the remote phosphor set-up by the substitution of the efficiency-droop-limited LEDs with laser diodes (LDs) that exhibit peak efficiencies at much higher operating currents. Although laser-excited remote phosphor (LRP) systems have already been employed in some commercial applications, the bottleneck in their performance is identified in the down-conversion process within the phosphor material. The high intensity exciting laser beam in combination with the temperature-dependent properties of phosphors can lead to thermally induced instabilities in the system. For this reason, an opto-thermal simulation framework is developed to investigate the optical and thermal interdependencies and derive the LRPS optimization parameters. The optical analysis is performed with commercial ray-tracing software, where the optical heat losses are computed and subsequently used as the volume heat source in thermal analysis implemented by the finite element method (F.E.M.). The question now arises as to how to properly model the phosphor material in such a simulation scheme. The LED experience has produced a variety of phosphors for lighting applications, most commonly powders in some appropriate resin matrix, which are treated simulation wise as bulk diffusers. As the low thermal conductivity of resins is deemed critical for their use in LRPS, recent research focuses on resin free materials such as glass phosphors, single crystals, polycrystalline dense ceramics, etc. The different modeling approaches of such solutions are investigated here as the scattering properties and surface topology of the samples can vary.
Keywords
- laser-exited, lighting systems, opto-thermal coupling, remote phosphor systems, scattering, simulation
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Computer Science(all)
- Computer Science Applications
- Mathematics(all)
- Applied Mathematics
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
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Physics and Simulation of Optoelectronic Devices XXVIII. ed. / Bernd Witzigmann; Marek Osinski; Yasuhiko Arakawa. SPIE, 2020. 112741E (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11274).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Opto-thermal simulation framework for the investigation of phosphor materials in laser-based lighting systems
AU - Chatzizyrli, Elisavet
AU - Wienke, Andreas
AU - Lachmayer, Roland
AU - Neumann, Jörg
AU - Kracht, Dietmar
N1 - Funding Information: The PhD program Tailored Light is funded by the Lower Saxony Ministry for Science and Culture (MWK), Germany.
PY - 2020/3/2
Y1 - 2020/3/2
N2 - Solid-state white light sources gain increasing interest due to their advanced characteristics compared to conventional lighting solutions. New design challenges are introduced in the remote phosphor set-up by the substitution of the efficiency-droop-limited LEDs with laser diodes (LDs) that exhibit peak efficiencies at much higher operating currents. Although laser-excited remote phosphor (LRP) systems have already been employed in some commercial applications, the bottleneck in their performance is identified in the down-conversion process within the phosphor material. The high intensity exciting laser beam in combination with the temperature-dependent properties of phosphors can lead to thermally induced instabilities in the system. For this reason, an opto-thermal simulation framework is developed to investigate the optical and thermal interdependencies and derive the LRPS optimization parameters. The optical analysis is performed with commercial ray-tracing software, where the optical heat losses are computed and subsequently used as the volume heat source in thermal analysis implemented by the finite element method (F.E.M.). The question now arises as to how to properly model the phosphor material in such a simulation scheme. The LED experience has produced a variety of phosphors for lighting applications, most commonly powders in some appropriate resin matrix, which are treated simulation wise as bulk diffusers. As the low thermal conductivity of resins is deemed critical for their use in LRPS, recent research focuses on resin free materials such as glass phosphors, single crystals, polycrystalline dense ceramics, etc. The different modeling approaches of such solutions are investigated here as the scattering properties and surface topology of the samples can vary.
AB - Solid-state white light sources gain increasing interest due to their advanced characteristics compared to conventional lighting solutions. New design challenges are introduced in the remote phosphor set-up by the substitution of the efficiency-droop-limited LEDs with laser diodes (LDs) that exhibit peak efficiencies at much higher operating currents. Although laser-excited remote phosphor (LRP) systems have already been employed in some commercial applications, the bottleneck in their performance is identified in the down-conversion process within the phosphor material. The high intensity exciting laser beam in combination with the temperature-dependent properties of phosphors can lead to thermally induced instabilities in the system. For this reason, an opto-thermal simulation framework is developed to investigate the optical and thermal interdependencies and derive the LRPS optimization parameters. The optical analysis is performed with commercial ray-tracing software, where the optical heat losses are computed and subsequently used as the volume heat source in thermal analysis implemented by the finite element method (F.E.M.). The question now arises as to how to properly model the phosphor material in such a simulation scheme. The LED experience has produced a variety of phosphors for lighting applications, most commonly powders in some appropriate resin matrix, which are treated simulation wise as bulk diffusers. As the low thermal conductivity of resins is deemed critical for their use in LRPS, recent research focuses on resin free materials such as glass phosphors, single crystals, polycrystalline dense ceramics, etc. The different modeling approaches of such solutions are investigated here as the scattering properties and surface topology of the samples can vary.
KW - laser-exited
KW - lighting systems
KW - opto-thermal coupling
KW - remote phosphor systems
KW - scattering
KW - simulation
UR - http://www.scopus.com/inward/record.url?scp=85097647385&partnerID=8YFLogxK
U2 - 10.1117/12.2546052
DO - 10.1117/12.2546052
M3 - Conference contribution
AN - SCOPUS:85097647385
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Physics and Simulation of Optoelectronic Devices XXVIII
A2 - Witzigmann, Bernd
A2 - Osinski, Marek
A2 - Arakawa, Yasuhiko
PB - SPIE
T2 - Physics and Simulation of Optoelectronic Devices XXVIII 2020
Y2 - 3 February 2020 through 6 February 2020
ER -