Eu2+ activated novel eulytite Na3Bi5(PO4)6: Eu3+ phosphors: Enhanced luminescence and thermal stability for photonics application

Recent progress in trivalent europium (Eu3+)-based inorganic phosphors for solid-state lighting: an overview

“…202 A multivalent (Eu 2+ /Eu 3+ ) europium ion-doped Eulytite-like Na 3 Bi 5 (PO 4 ) 6 phosphor was synthesized, and its structural and optical properties were studied. 203 X-ray photoelectron spectroscopy (XPS) analysis confirmed the co-existence of Eu 2+ and Eu 3+ ions, which exhibited characteristic emission lines (4f-5d transition of Eu 2+ , 4f-4f transitions of Eu 3+ ions). The presence of divalent europium ions leading to tunable emission could be achieved.…”

Tunable ultra-broadband full-visible-spectral emission of Bi3+-doped aluminate phosphors enabled by structure transformation and site occupancy engineering

“…7 Additionally, the latter exhibits better color stability because its color is solely determined by the emission light of phosphors. [11][12][13][14] For example, Wei et al encapsulated multi-color phosphors, including Na 2 HfSi 2 O 7 :Eu 2+ , (Sr, Ba) 2 SiO 4 : Eu 2+ and CaAlSiN 3 :Eu 2+ based on a near-ultraviolet chip, resulting in a WLED chip with a R a of 92.6 and a CCT of 4617 K. 15 However, different degradation rates of multiphase phosphors during long-term operation usually produce color aberrations, and consequently decrease the lighting quality of pc-WLEDs. 16,17 In other words, it is difficult to control the color balance for multi phosphor mixtures because of their different thermal stability properties, which is an undesirable problem.…”