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

Abstract

Using the combustion method, red emitting Sr4Al14O25:Eu 3+ and Sr4Al14O25:Sm 3+ phosphors were synthesized. The properties of photoluminescence were also studied. The red (614 nm) emission from Sr4Al14O25:Eu 3+ phosphor, at excitation 394 nm. The excitation peak was around 404 nm and was attributed to 6 H5/2→ 4 F7/2, while the emission spectrum had emission peaks at 565 nm and 603 nm for Sr4Al14O25:Sm 3+ phosphor. Furthermore, the chromaticity coordinates of Sr4Al14O25:Eu 3+ and Sr4Al14O25:Sm 3+ phosphors were found in the red region (0.677, 0.322) and (0.640, 0.359) by the Commission International de l'Eclairage respectively. According to the current findings, Sr4Al14O25:Eu 3+ and Sr4Al14O25:Sm 3+ phosphors can be used as a red emitting phosphor in near-ultraviolet (n-UV) based w-LEDs.

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

“…Further research is needed because it is necessary for w‐LEDs to emit red light and to achieve an improvement over reddish light. As a result, the samples may be used as red‐emitting lights in various applications such as safety indication, image storage, fingermark detection, and luminous paint [36].…”

“…Sm 3+ ions are excited to the higher energy level of 6 P 3/2 , and decay subsequently nonradiatively to the 4 G 5/2 metastable state. Due to the enormous energy difference between 4 G 5/2 and 6 H 11/2 , further multiphonon relaxation is minimal [30,31].…”

“…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]. Inorganic materials doped with trivalent lanthanide ion have recently become the cynosure of scientists in the entire field of science and technology due to their excellent physicochemical properties and plausible applications in various areas such as solid-state lighting (SSL), display panels, phosphor-converted white light-emitting diodes (pc-w-LEDs), and various electronic devices [11][12][13][14]. Sm 3+ ions in phosphors emit a brilliant reddish light, which improves the colour-rendering index (CRI) of phosphor-converted w-LEDs [15].…”

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

“…Photoluminescence properties of Sr3La(AlO)3(BO3)4:Eu 3+ phosphor Figure 2 displays the excitation spectra of Sr3La(AlO)3(BO3)4:Eu 3+ phosphor were studied in the wavelength range of 350 and 400 nm after the emission peak at 617 nm. The excitation peaks at 362, 380, and 394 nm, corresponding to Eu 3+ ions transitions 7 F0→ 5 L9, 7 F0→ 5 G3, and 7 F0→ 5 L6 [27]. The maximum excitation peak in the Sr3La(AlO)3(BO3)4:Eu 3+ phosphor was determined to be 394 nm.…”

“…The desire to use Sm 3+ ions efficient emission in a variety of materials, particularly for phosphors in red and orange, but with the introduction of InGaN and GaN laser diodes in the excitation peak at 405 nm, where Sm 3+ ions exhibits a quite substantial absorption, visible laser output has also grown. Numerous studies of Sm 3+ ions in various materials, including phosphors [13,14], single crystals [15,16], and glasses [17,18]. The Sm 3+ in phosphors always exhibits a bright reddish emission, which can improve the color-rendering index (CRI) of phosphorconverted w-LEDs [19].…”