Design of a mixed-anionic-ligand system for a blue-light-excited orange-yellow emission phosphor Ba1.31Sr3.69(BO3)3Cl:Eu2+. Issue 9 (30th January 2020)

• Record Type: Journal Article
• Authors: Wu, Haiyan; Li, Huimin; Jiang, Lihong; Pang, Ran; Zhang, Su; Li, Da; Liu, Guanyu; Li, Chengyu; Feng, Jing; Zhang, Hongjie
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 9(2020)
• Page Start: 3040
• Page End: 3050
• Publication Date: 2020-01-30
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc06360a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A novel blue-light-excited orange-yellow emission Ba1.31 Sr3.69 (BO3 )3 Cl:Eu 2+ phosphor was designed by introducing a mixed-anionic-ligand system (Cl −, O 2− ). Abstract : The essence of improving the quality of white-light-emitting diodes (w-LEDs) is to explore effective red-emitting phosphor materials. It is well known that the redshifts of excitation and emission spectra are related to crystal field splitting ( ε cfs ), centroid shift ( ε c ) and Stokes shift (Δ S ). In this article, the design of a system of mixed-anionic-ligands with different electronegativity and ion radius is introduced to achieve the redshift of excitation and emission spectra, which can not only effectively improve ε cfs, but also has a positive impact on the increase of ε c and Δ S . Ba1.31 Sr3.69 (BO3 )3 Cl:Eu 2+ emerged as a new high-performance orange-yellow-emitting phosphor, which can efficiently be excited by a blue InGaN chip and exhibit a broad asymmetric band covering from 480 to 750 nm with a peak centered at 595 nm. Based on density functional theory calculations from first principles, the orange-yellow emission is caused by the Eu 4f electronic structure. Compared with commercially available w-LED phosphor Y3 Al5 O12 :Ce 3+ (YAG:Ce 3+ ), the more red-emitting component in this phosphor leads to an excellent color rendering index (CRI, R a = 91) and a lower correlated color temperature (CCT, 4568 K) when employed in a phosphor-converted LED (pc-LED). In addition, good resistance to thermal quenching is also shown in this material; its integrated intensity at 373 K still maintains ∼86.4% of the one at room temperature. These results indicate that the Ba1.31 Sr3.69 (BO3 )3 Cl:Eu 2+ phosphor can be a promising candidate for high quality white pc-LEDs.