Synthesis and Photoluminescence Properties of Ca5(PO4)3F: Ln (Ln: Dy3+, Eu3+ and Sm3+) Phosphors for near UV-based solid state lighting

Abstract

The wet chemical synthesis of Ca5(PO4)2F host with lanthanide doped Dy3+, Eu3+ and Sm3+ was reported. The X-ray diffraction (XRD), structural and photoluminescence characteristics of phosphors were thoroughly investigated. The hexagonal system with the space group P 63/m (176) was verified by X-ray powder diffraction. Under UV excitation (352 nm), Ca5(PO4)2F:Dy3+ emits 481 nm (blue) and 575 nm (yellow), corresponding to 4F9/2→6H15/2 (magnetic dipole) and 4F9/2→6H13/2 (electric dipole) transitions, respectively. When Ca5(PO4)2F:Eu3+ phosphor was excited at 394 nm, the emission spectra showed strong bands at 591 nm (orange) and 614 nm (red). When excited at 403 nm, the emission spectra of Sm3+ activated Ca5(PO4)2F phosphor displayed emission peaks at 565 nm (yellow) and 599 nm (orange), respectively. The research analyses the photoluminescence characteristics of Ca5(PO4)3F: Ln (Ln: Dy3+, Eu3+ and Sm3+) as a possible material for near UV-based solid-state lighting.

Synthesis and Photoluminescence characterization of Sr3La(AlO)3(BO3)4:Eu3+,Sm3+ Phosphor for W-LED

“…To our observation for all the studied Sr3La(AlO)3(BO3)4:Eu 3+ and Sr3La(AlO)3(BO3)4:Sm 3+ phosphors emission points are found to be located in the red region. Hence, the present red-emitting phosphors find remarkable applications in near ultraviolet excited for w-LEDs [40,41].…”

“…Due to advantages of great brightness, low power consumption, and extended operating life, white lightemitting diodes (w-LEDs) have been regarded as significant solid-state light sources [1,2]. Commercial w-LED currently employ a blue InGaN LED chip to excite a yellow emitting YAG:Ce phosphor, however this method renders colour poorly in the red region, resulting in a very low colour rendering index (CRI) [3]. Additionally, compared to green and blue phosphors, the luminous efficacy of red phosphor triggered by n-UV is significantly lower.…”

“…As a result, the creation of novel, highly efficient red phosphors triggered by n-UV chips has received a lot of attention in the process of making w-LEDs [4]. Due to 5 D0→ 7 FJ (J=0, 1,2,3,4) transitions, the Eu 3+ ion has been identified as one of the best red activators in the phosphors. Examples of this include Eu 3+ doped Ca12Al14O32F2 [5], LaBMoO6 [6], Sr2LiScB4O10 [7], Bi4O3(BO3)(PO4) [8], LiYGeO4 [9], Sr5(PO4)3F [10],…”

Synthesis and Photoluminescence properties of a red emitting Sr4Al14O25:Eu3+, Sm3+phosphorsfor near UV based w-LEDs

“…The color-coordinate problem is important when determining the effectiveness of phosphors. As a consequence, the PL spectra at 394 and 404 nm were used to compute the chromaticity coordinates of Sr4Al14O25:Eu 3+ and Sr4Al14O25:Sm 3+ [23,24]. The Sr4Al14O25:Eu 3+ phosphor in Figure 7 has a CIE coordinate of (0.677, 0.322), whereas the Sr4Al14O25:Sm 3+ phosphor has a coordinate of (0.640, 0.359).…”

Photoluminescence characteristics of novel Sm3+ ions‐doped La1.4Al22.6O36 phosphor for n‐UV w‐LED

“…Phosphor is essential in the production of w-LEDs, which are regarded as the next-generation lighting source because of their long lifetime, high efficiency, and function [5][6][7]. The upcoming aluminate phosphors have received increasing attention as an essential inorganic luminescent material due to their marked qualities such as improved luminous efficiency, superior chemical stability, and no radiation [8][9][10].…”