Nano Wave Plates Structuring and Index Matching in Transparent Hydroxyapatite-YAG Ce Composite Ceramics for High Luminous Efficiency White Light-Emitting Diodes

Nano Wave Plates Structuring and Index Matching in Transparent Hydroxyapatite-YAG : Ce Composite Ceramics for High Luminous Efficiency White Light-Emitting Diodes

© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 32(2020), 1 vom: 22. Jan., Seite e1905951
1. Verfasser: Huang, Ping (VerfasserIn)
Weitere Verfasser: Zhou, Beiying, Zheng, Qi, Tian, Yuan, Wang, Mengmeng, Wang, Lianjun, Li, Jianlin, Jiang, Wan
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article ceramic color converters high-power WLEDs hydroxyapatite nano wave plates transparent ceramics
Beschreibung
Zusammenfassung:© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Replacing traditional luminous silicone or resins with phosphor in ceramics (PiCs) as color converters has been proposed as an efficient way to improve thermal stability of high-power white light-emitting diodes (WLEDs). However, excessive light scattering in existing PiCs results in enormous phosphor-converted light losses, which makes the luminosity of current PiCs color converters less efficient and means that they can only be used in devices working in reflective mode. By introducing nano wave plate structuring and Rayleigh scattering, luminous hydroxyapatite (HA)-YAG: Ce ceramics are prepared from mesoporous HA nanorods and YAG: Ce phosphors at 850 °C, enabling for the first time WLEDs equipped with PiC color converters in transmission mode. With low-temperature sintering and a highly transparent matrix, the quantum yield of HA-YAG: Ce retains ≈90% of the raw phosphor, and WLEDs with the color converters exhibit a record luminous efficiency of 170 lm W-1 and a correlated color temperature below 4500 K. A facile and practical strategy of using nano structural modulation to eliminate birefringence-induced light scattering for fabricating high-performance ceramic converters suitable for multiple mode luminaires is demonstrated
Beschreibung:Date Completed 07.01.2020
Date Revised 01.10.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.201905951