Constructing a single-white-light emission by finely modulating the occupancy of luminescence centers in europium-doped (Ca1−xSrx)9Bi(PO4)7 for WLEDs. Issue 28 (26th June 2020)

• Record Type: Journal Article
• Authors: Cao, Yaxin; Wang, Xicheng; Ding, Jianyan; Zhou, Xiaopeng; Seto, Takatoshi; Wang, Yuhua
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 28(2020)
• Page Start: 9576
• Page End: 9584
• Publication Date: 2020-06-26
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc02467h
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Single-white-light-emission with broad band is achieved in (Ca1− x Sr x )9 Bi(PO4 )7 :0.09Eu based on structural evolution. Abstract : Nowadays, phosphor-converted white light-emitting diodes (WLEDs) have drawn great attention in the field of lighting. The most currently used method combining a blue LED chip with a yellow YAG:Ce phosphor suffers from a high correlated color temperature (CCT) and low color rendering index (CRI) due to the deficiency of red emission. For achieving white light with a higher quality, the additional red component should be supplemented in the emission spectrum. In this study, we propose a design strategy to construct a single-white-light-emitting phosphor by modification of the spectrum based on structural evolution. After the introduction of strontium into a multi-cation site Ca9 Bi(PO4 )7 :Eu phosphor and finely modulating the occupancy of the luminescence centers, tunable emission with band broadening and a red-shift was realized. Moreover, warm white light with an Ra of 87 and CCT of 3383 K was obtained based on the (Ca1− x Sr x )9 Bi(PO4 )7 :Eu single phosphor, which suggests its good potential in WLED applications.