Eu3+‐doped glass as a color rendering index enhancer in phosphor‐in‐glass. Issue 7 (6th February 2018)

• Record Type: Journal Article
• Authors: Orozco Hinostroza, Ignacio E.; Desirena, Haggeo; Hernandez, Jose; Molina, Jorge; Moreno, Ivan; De la Rosa, Elder
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 7(2018)
• Page Start: 2914
• Page End: 2920
• Publication Date: 2018-02-06
• Subjects: phosphors -- photoluminescence -- yttrium aluminum garnet; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15464
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: A new method for improving color rendering index (CRI) and low correlated color temperature (CCT) in high‐power white‐light‐emitting diodes (WLEDs) is proposed. We used a configuration of phosphor‐in‐glass (PIG) and studied light output changes with the increment in concentration of yellow‐emitting Y3 Al5 O12 :Ce 3+ (YAG:Ce 3+ ) phosphor. The PIG was coupled on the top of blue‐light‐emitting diodes (LED) chip (465 nm). To compensate the lack of red emission in the phosphor, Eu 3+ ‐doped tellurium glass with different europium content was employed as a red emitter. The suitable contents of YAG:Ce 3+ and Eu 3+ were 7.5 weight percent (wt%) and 3 mol percent (mol%), respectively. The CRI value went from 72 to 82, whereas the CCT was reduced from 24 933 to 6434 K. The proposed structure can improve CCT as well as CRI of WLEDs just by placing a glass on top.