Ca₃Lu(AlO)₃(BO₃)₄ : Sm³⁺: a novel red-emitting phosphor with high colour purity for NUV-based warm white LEDs

Abstract

Ca3Lu(AlO)3(BO3)4 : Sm3+: a novel red-emitting phosphor with high colour purity up to 98.53% and excellent thermal stability (the red emission intensity of CLAB : 0.05Sm3+ at 425 K is 86.6% of that at 300 K) for NUV-based warm white LEDs.

Bright Red-Emitting Ca3LuAl3B4O15:Ce3+,Sm3+ Phosphors with High Thermal Stability for Elevating the Color Rendering of Near-Ultraviolet-Based White-Light-Emitting Diodes

“…The PLE spectrum of CLAB:Sm 3+ comprises a series of narrow bands, ascribed to the f–f transition of Sm 3+ Figure a. Similarly, the PL emission of the CLAB:Sm 3+ phosphor has multiple bands (565, 609, 647, and 704 nm) that correspond to the transitions from the excited 4 G 5/2 level to the 6 H J /2 ( J = 5, 7, 9, and 11) levels (Figure b). ,,− The PL intensity of the 4 G 5/2 → 6 H 7/2 transition initially increased with the increasing Sm 3+ content, and after reaching to a maximum value for x = 0.1, it declined as the Sm 3+ content was further increased. The decay curves were tested at various Sm 3+ concentrations (Figure S5a,b).…”

“…Color purity is generally regarded to be an important factor in evaluating phosphor efficiency and was determined by the equation where ( x , y ) denotes the CIE of the phosphor, ( xi , yi ) corresponds to the white illumination, and ( xd , yd ) specifies the dominant wavelength.…”

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

“…Khan et al . reported near‐UV excitable Ca 3 Lu(AlO) 3 (BO 3 ) 4 :Sm 3+ red‐emitting phosphors with high efficiency, good stability and with a Kagome‐type lattice (star‐shaped), leaving trigonal tunnels (occupied by Lu/Ca ions) and apatite‐like‐tunnels (with Ca/Lu2 ions and isolated BO 3 3− groups) . Sm 3+ (with an excitation band between 400 and 410 nm) was found to better than Eu 3+ for obtaining near‐UV emitting chips.…”

Improving thermal stability of novel single-component white-light emitting phosphor Ca8MgLu(PO4)7:Tm3+, Dy3+ by back-energy-transfer

“…To overcome such disadvantages, many researchers are now working on the new combination method, which includes the tri-color-based red-green-blue (RGB) or double-dopants-based phosphors under ultraviolet (UV) or near ultraviolet (NUV) excitation. [2][3][4][5] The single-component host matrix can serve as host frameworks for the new combination strategy due to their stable color output and reducibility, [6,7] as well as their improvement for the luminescence reproducibility and efficiency. [8,9] However, the selection of the single-component host matrix can effectively change the energy transfer, crystal field intensity and the valence bond of activator sites and hence influence the luminescent efficiency, color and intensity stability of phosphors.…”