Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

Abstract

In this study, Sm 3+ -doped double-perovskite Mg 2 InSbO 6 phosphors were synthesized via high-temperature solid-state reaction. Mg 2 InSbO 6 belongs to the doubleperovskite family with a space group of R3 (No.148). The photoluminescence (PL) spectrum illustrates that Mg 2 InSbO 6 :0.05Sm 3+ phosphor can emit intense orange-red emission light at 607 nm due to the 4 G 5/2 → 6 H 7/2 transition. The optimum concentration of Mg 2 InSbO 6 :xSm 3+ is confirmed to 0.05 mol. The asymmetric ratio ( 4 G 5/2 → 6 H 9/2 / 4 G 5/2 → 6 H 5/2 ) of Mg 2 InSbO 6 :0.05Sm 3+ phosphor is 2.73. The quenching temperature exceeds 500 K, illustrating that Mg 2 InSbO 6 :Sm 3+ sample has excellent heat resistance. The high color purity and correlated color temperature (CCT) of Mg 2 InSbO 6 :Sm 3+ phosphors are obtained. Furthermore, a white light-emitting diode (w-LED) is successfully fabricated, possessing CCT of 6769 K and high color rendering index (R a ) of 89. Therefore, the orange-red-emitting Mg 2 InSbO 6 :Sm 3+ phosphors exhibit great potential to apply in solid-state lighting fields. K E Y W O R D S LED, luminescence, Mg 2 InSbO 6 :Sm 3+ , phosphor | 5967 LIU et aL. | INTRODUCTIONw-LEDs show a high potential application in displays and lighting. In addition, w-LEDs are replacing conventional solid-state lighting sources (fluorescent, incandescent, and metal-halide lamps), which are based on admirable merits, like high efficiency, energy conservation, long lifetimes, and eco-friendliness. [1][2][3][4] Currently, the method to fabricate commercial w-LEDs is a combination of yellow phosphor Y 3 Al 5 O 12 :Ce 3+ (YAG) and a blue LED chip. However, these products show high CCT and poor R a , owing to the lack of red composition. 5,6 These inevitable disadvantages greatly limit their application and popularization. An alternative way is developed using trichromatic (green, blue, and red) phosphors coated on the near-ultraviolet (n-UV) chips, which have recently received increasing attention. 7 Nitride is regarded as an excellent red phosphor like SrLiAl 3 N 4 :Ce 3+ , Sr 2 [BeAl 3 N 5 ]:Eu 2+ , and CaAlSiN 3 :Eu 2+ . 8-10 However, the synthesis condition (high temperature and high pressure) is strict. 11,12 Hence, exploring new orange-red-emitting or redemitting phosphors with good luminescence properties is extremely urgent. 13 Sm 3+ with 4f 5 electronic configuration is an important activator ion among the lanthanoid ions. [14][15][16] Sm 3+ usually exhibits orange-red or red emission in the visible region while excited by n-UV or blue light, which attributes to the 4 G 5/2 → 6 H 7/2 or 4 G 5/2 → 6 H 9/2 transitions, respectively. 17,18

A novel near-infrared phosphor Mg2InSbO6:Cr3+ with high quantum efficiency and considerable persistent luminescence duration

“…1c. 14 [SbO 6 ] octahedra are separated from each other. The [(Mg/In)O 6 ] octahedron is more distorted than the [SbO 6 ] octahedron.…”

Synthesis and photoluminescence properties of a novel blue-emitting phosphor Ca3TeO6 co-doped with Tm3+, Na+

“…The spectrometer (Edinburgh FLS 980) was used to represent the PL spectra. In order to ascertain the presumable substitute sites of Tm 3+ ions in the Ca 3 TeO 6 matrix the percentage radius was calculated via following Equation (1) [13]:…”