A novel blue emitting phosphor LaScO3:Bi3+ for white LEDs: high quantum efficiency, high color purity and excellent thermal stability. (December 2022)

• Record Type: Journal Article
• Authors: Yang, H.; Li, P.; Fu, X.; Ye, Z.; Huo, X.; Wang, Y.; Wu, Q.; Suo, H.; Li, L.; Wang, Z.
• Is Part Of: Materials today chemistry. Volume 26(2022)
• Publication Date: 2022-12
• Subjects: LaScO3:Bi3+ -- High quality blue phosphor -- Tunable luminescence -- Anomalous thermal quenching; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2022.101050
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: Series of blue phosphors La1- x Bi x ScO3 ( x = 0–0.6) (LSO) were synthesized by the high temperature solid state method. Under the 365 nm near ultraviolet (NUV) irradiation, when the value of x is increased, the phosphor can emit blue from deep to shallow. The LSO phosphor presents an internal quantum efficiency of up to 98%, high color purity of 92.26% as well as excellent thermal stability. When x ≥ 0.2, Bi 3+ -doped phosphors have diverse FWHM ranging from 153 nm to 43 nm. Especially, when x = 0.5, the material shows an abnormal thermal quenching, and emission intensity at 573K can reach 128.3% of that at room temperature. The white light emitting diode (LED) was fabricated by combining the NUV LED chip (370 nm) with a mixture of LSO:0.007Bi 3+ along with green Y3 (Al, Ga)5 O12 :Ce 3+ and red CaSiAlN3 : Eu 2+ phosphors, which show a high color rendering index Ra = 90.2, a low correlated color temperature CCT = 3999 K. The results demonstrate that LSO phosphor has potential application in the field of white LEDs. Graphical abstract: Image 1 Highlights: LSO:Bi presents the high quantum efficiency of up to 98% and high color purity of 92.26%. When x > 0.2, Bi 3+ -doped phosphor has diverse FWHM ranging from 153 nm to 43 nm. When x = 0.5, the emission intensity at 573K can reach 128.3% of that at room temperature. White LEDs show Ra = 90.2 and CCT = 3999 K.