Self-Activating Strontium Orthoborate Blue Phosphors Induced by Cation and Anion Deficiencies and Their Rare-Earth-Free White Ultraviolet Light-Emitting Diodes

Sungjun Yang; Sangmoon Park

doi:10.1021/acs.jpclett.2c02591

Self-Activating Strontium Orthoborate Blue Phosphors Induced by Cation and Anion Deficiencies and Their Rare-Earth-Free White Ultraviolet Light-Emitting Diodes

J Phys Chem Lett. 2022 Oct 20;13(41):9766-9770. doi: 10.1021/acs.jpclett.2c02591. Epub 2022 Oct 13.

Authors

Sungjun Yang¹, Sangmoon Park²

Affiliations

¹ Department of Environmental Energy & Chemistry, College of Engineering, Silla University, Busan 46958, Republic of Korea.
² Department of Environmental Energy & Chemistry, College of Engineering and Department of Fire Protection and Safety Management, College of Health and Welfare, Silla University, Busan 46958, Republic of Korea.

PMID: 36226810
DOI: 10.1021/acs.jpclett.2c02591

Abstract

Self-activating blue-light-emitting strontium orthoborate phosphors, viz., Sr₃B_2+xO_6+3x/2 and Sr₃B_2+xO_6+3x/2-δ (x ranges from -0.3 to 0.1), were obtained by varying the number of BO_3/2 and anion deficiencies. The integrated intensity observed from the oxygen 1s profile obtained via X-ray photoelectron spectroscopy indicated the relative concentrations of the oxygen vacancies in the Sr₃B_2+xO_6+3x/2 (x = 0, -0.1, and -0.3) and Sr₃B₂O_6-δ phosphors. The structures of Sr₃B₂O₆, Sr₃B_2.1O_6.15, Sr₃B_1.9O_5.85, and Sr₃B₂O_6-δ with crystal orientations were analyzed based on high-resolution synchrotron powder X-ray diffraction data. A mixture of rare-earth-free blue Sr₃B₂O_6-δ and yellow Sr_2.45Ba_0.5Na_0.05Al_0.95Sn_0.05O_4-αF_1-δ phosphors, incorporated on a 315 nm UV-LED chip, can generate a white-light UV-LED.