Broadband white luminescent phosphor Ba(Si7−xAlx)Liy(N10−x+yOx−y):Eu2+ with a high color rendering index for solid state lighting. Issue 16 (12th April 2021)

• Record Type: Journal Article
• Authors: Takeda, Takashi; Funahashi, Shiro; Xie, Rong-Jun; Hirosaki, Naoto
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 16(2021)
• Page Start: 5497
• Page End: 5504
• Publication Date: 2021-04-12
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc04228e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Broadband white luminescent particles by introducing Li into the crystal structure of Ba(Si7− x Al x )(N10− x O x ):Eu 2+ . Abstract : Analysis of a mixture product from Ba3 N2, Si3 N4, AlN, Li3 N, and EuN reveals a broadband white luminescent particle Ba(Si7− x Al x )Li y (N10− x + y O x − y ):Eu 2+ . It shows a high color rendering index value of 90 despite being an Eu 2+ only-doped material. The emission spectrum at a low temperature of −190 °C can be decomposed into three Gaussian profiles, indicating a crystal structure with three unique Eu coordination spheres. Single crystal XRD analysis shows that the single Ba site in Ba(Si7− x Al x )(N10− x O x ) splits into three Ba sites. From the chemical analysis and bond valence sum map of the Li ion, we estimate that Li intrudes into the Ba(Si7− x Al x )(N10− x O x ) lattice and shifts some Ba from its original position to two new Ba sites. This is a unique approach where a new phosphor is obtained by introducing a small cation into a known crystal structure.