High-performance Al2O3‒YAG:Ce composite ceramic phosphors for miniaturization of high-brightness white light-emitting diodes
Source abstract
Abstract
Abstract The miniaturization of high-brightness white light-emitting diodes (WLEDs) is limited by the low thermal performance of phosphors. In this study, the microstructure, optical properties, and thermal performance of Al2O3–Y3Al5O12:Ce3+ (Al2O3–YAG:Ce) composite ceramics fabricated by hot pressing were investigated. By promoting the growth of Al2O3 grains while maintaining a high composite density, thermal performance of the composite ceramics was significantly increased. The thermal conductivity of a Al2O3–40-vol% YAG:Ce ceramic reached 21.8 W/m/K, which is close to the theoretical value. In addition, this composite ceramic exhibited the highest energy efficiency. After packaging with a high-power LED chip with dimensions of 1 mm × 1 mm, a high luminous flux of 639 lm was generated, while the reduction in output power at 250 °C was as low as 6%. This indicated excellent high-temperature stability and potential for applications in solid-state lighting.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · GaN-based semiconductor devices and materials · Ga2O3 and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (48)
Show source-provided references
1. Prospects for LED lighting10.1038/nphoton.2009.32 ↗
2. Current status of GaN-based solid-state lighting10.1557/mrs2009.28 ↗
3. Illumination with solid state lighting technology10.1109/2944.999186 ↗
4. LED lighting efficacy: status and directions10.1016/j.crhy.2017.10.013 ↗
5. White light-emitting diodes: history, progress, and future10.1002/lpor.201600147 ↗
6. High power LEDs - technology status and market applications10.1002/1521-396X(200212)194:2<380::AID-PSSA380>3.0.CO;2-N ↗
7. Status and future of high-power light-emitting diodes for solid-state lighting10.1109/JDT.2007.895339 ↗
8. "Cree Company", https://www.cree.com/led-components/products/led-modules-integrated/lmr4-led-module.
9. "Cree company
10. Luminous flux to input power ratio, power factor and harmonics when dimming high-pressure sodium and LED luminaires used in road lighting
11. Thermal-stability comparison of glass- and silicone-based high-power phosphor-converted white-light-emitting diodes under thermal aging10.1109/TDMR.2012.2206813 ↗
12. Temperature quenching of yellow Ce3+ luminescence in YAG:Ce10.1021/cm8030768 ↗
13. A nearly ideal phosphor-converted white light-emitting diode10.1063/1.2901378 ↗
14. A new-generation color converter for high-power white LED: transparent Ce3+:YAG phosphor-in-glass10.1002/lpor.201300140 ↗
15. Transparent YAG:Ce ceramics for WLEDs with high CRI: Ce3+ concentration and sample thickness effects10.1016/j.ceramint.2016.01.079 ↗
16. Spectrum regulation of YAG:Ce transparent ceramics with Pr, Cr doping for white light emitting diodes application10.1016/j.jeurceramsoc.2017.03.061 ↗
17. The Cr-doping effect on white light emitting properties of Ce:YAG phosphor ceramics10.1111/jace.14717 ↗
18. Luminescence characteristics of the Ce3+-doped garnets: the case of Gd-admixed Y3Al5O12 transparent ceramics10.1364/OME.5.002902 ↗
19. YAG: Ce3+,Mn2+ transparent ceramics prepared by gel-casting for warm white LEDs10.1016/j.jlumin.2019.05.055 ↗
20. Microstructure optimization of the composite phase ceramic phosphor for white LEDs with excellent luminous efficacy10.1364/OL.40.005479 ↗
21. Influence of the Ce:YAG amount on structure and optical properties of Ce:YAG-PMMA composites for white LED10.1515/zpch-2015-0703 ↗
22. Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics10.1038/s41467-018-03467-7 ↗
23. Phase composition, microstructure and luminescent property evolutions in “light-scattering enhanced” Al2O3-Y3Al5O12:Ce3+ ceramic phosphors10.1016/j.jeurceramsoc.2018.03.043 ↗
24. Thermal conductivity, diffusivity, and expansion of Y2O3, Y3Al5O12, and LaF3 in the range 77°–300°K10.1063/1.1709730 ↗
25. Low thermal conductivity in garnets10.1111/j.1151-2916.1997.tb02937.x ↗
26. Ce:YAG transparent ceramics for applications of high power LEDs: thickness effects and high temperature performance10.1016/j.matlet.2014.10.114 ↗
27. Thermal conduction in artificial sapphire crystals at low temperatures. I. Nearly perfect crystals
28. Constrained densification of alumina/zirconia hybrid laminates, I: experimental observations of processing defects10.1111/j.1151-2916.1997.tb03075.x ↗
29. Thermal expansion of yttrium aluminum garnet10.1111/j.1151-2916.1971.tb12315.x ↗
30. Study of the stability of the molten zone and the stresses induced during the growth of Al2O3–Y3Al5O12 eutectic composite by the laser floating zone technique10.1016/j.jeurceramsoc.2010.08.022 ↗
31. Tunable colorimetric performance of Al2O3-YAG:Ce3+ eutectic crystal by Ce3+ concentration10.1016/j.jlumin.2017.02.011 ↗
32. Composite phase ceramic phosphor of Al2O3-Ce:YAG for high efficiency light emitting10.1364/OE.23.017923 ↗
33. Design of laser-driven high-efficiency Al2O3/YAG:Ce3+ ceramic converter for automotive lighting: fabrication, luminous emittance, and tunable color space10.1016/j.dyepig.2016.12.071 ↗
34. Al2O3–YAG:Ce composite phosphor ceramic: a thermally robust and efficient color converter for solid state laser lighting10.1039/C6TC03215J ↗
35. Color tuning of Lu3Al5O12 :Dy3+ ceramic-based white light-emitting phosphors via Yb incorporation10.1016/j.jeurceramsoc.2016.07.025 ↗
36. The effect of the porosity on the Al2O3-YAG:Ce phosphor ceramic: microstructure, luminescent efficiency, and luminous stability in laser-driven lighting10.1016/j.jallcom.2019.01.175 ↗
37. Pore-existing Lu3Al5O12 :Ce ceramic phosphor: an efficient green color converter for laser light source10.1016/j.jlumin.2018.01.014 ↗
38. The effect of particle size on the thermal conductivity of ZnS/diamond composites10.1016/0956-7151(92)90205-S ↗
39. Comparison of two-phase thermal conductivity models with experiments on dilute ceramic composites10.1111/jace.12488 ↗
40. Effective medium models for the optical properties of inhomogeneous materials10.1364/AO.20.000026 ↗
41. Thermal conductivity of zirconia–alumina composites10.1016/j.ceramint.2004.09.018 ↗
42. Thermal conductivity of alumina inclusion/glass matrix composite materials: local and macroscopic scales10.1016/j.jeurceramsoc.2006.09.017 ↗
43. Thermal conductivity bounds for isotropic, porous materials10.1016/j.ijheatmasstransfer.2004.12.032 ↗
44. Al2O3-YAG:Ce composite ceramics for high-brightness lighting10.1364/OE.27.000872 ↗
45. Composite ceramic with high saturation input powder in solid-state laser lighting: microstructure, properties, and luminous emittances10.1016/j.ceramint.2018.08.008 ↗
46. Effective thermal conductivity of composites with interfacial thermal barrier resistance10.1177/002199838702100602 ↗
47. Stable, heat-conducting phosphor composites for high-power laser lighting10.1021/acsami.8b00074 ↗
48. Interfacial thermal resistance and thermal conductivity in nanograined SrTiO310.1143/APEX.3.031101 ↗