Facile synthesis of YAG:Ce3+ thick films for phosphor converted white light emitting diodes. Issue 13 (November 2015)

• Record Type: Journal Article
• Authors: Zhao, Yunyun; Xu, Huarui; Zhang, Xiuyun; Zhu, Guisheng; Yan, Dongliang; Yu, Aibing
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 13(2015:Nov.)
• Page Start: 3761
• Page End: 3764
• Publication Date: 2015-11
• Subjects: YAG:Ce3+ Phosphor film -- pc-WLEDs -- Combustion pyrolysis -- Electroluminescence properties; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.05.017
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: A crucial barrier in the development of YAG:Ce 3+ phosphor films in the application for phosphors converted white light emitting diodes (pc-WLEDs) is to prepare the films, which are thick enough to provide considerable optical performance for matching the optical properties of the blue light chip. To overcome this barrier, this study reports a novel sol–gel method that takes advantage of the combustion pyrolysis process with glycine and urea as fuel. Transparent luminescent YAG:Ce 3+ phosphor film with a thickness of 5.1 μm and homogeneous grain size of 60 nm was obtained on quartz substrate. The as-synthesized YAG:Ce 3+ phosphor films have a quantum yield of 56% at 457 nm excitation. The YAG:Ce 3+ phosphor films incorporated into pc-WLED were shown to have a slightly lower luminous efficacy of 82 lm/W, but a warmer correlated colour temperature of 4536 K as well as a higher colour rendering index of 75.8.