Tunable Optical Properties and Enhanced Thermal Quenching of Non-Rare-Earth Double-Perovskite (Ba_1–xSr_x)₂YSbO₆:Mn⁴⁺ Red Phosphors Based on Composition Modulation

Abstract

Non-rare-earth Mn-doped double-perovskite (BaSr )YSbO:Mn red-emitting phosphors with adjustable photoluminescence are fabricated via traditional high-temperature sintering reaction. The structural evolution, variation of Mn local environment, luminescent properties, and thermal quenching are studied systematically. With elevation of Sr substituting content, the major diffraction peak moves up to a higher angle gradually. Impressively, with increasing the substitution of Ba with Sr cation from 0 to 100%, the emission band shifts to short-wavelength in a systematic way resulting from the higher transition energy from excited states to ground states. Besides, this blue-shift appearance can be illuminated adequately using the crystal field strength. The thermal quenching of the obtained solid solution is dramatically affected by the composition, with the PL intensity increasing 16% at 423 K going from x = 0 to 1.0. The w-LEDs component constructed by coupling the UV-LED chip with red/green/blue phosphors demonstrate an excellent correlated color temperature (CCT) of 3404 K, as well as color rendering index (CRI) of 86.8.

Enhancing photoluminescence properties of Mn4+‐activated Sr4−xBaxAl14O25 red phosphors for plant cultivation LEDs

“…When excited at 346 nm, there are a strong emission band can be detected in range from 600 to 700 nm. The peak at 655 nm can be attributed to the spin‐forbidden 2 E g – 4 A 2g transition of Mn 4+ 0 . It is evidence that the phosphor has a good promising for plant growth field.…”

“…General speaking, activators and host are essential components of phosphors. Lately, non–rare earth (Mn 4+ ) ion with a naked 3 d 3 electron configuration have received more attention owing to its unique luminescence properties . The advantaged of tetravalent manganese ion is visible, such as nontoxicity, widely sources and low‐cost than the rare earth activator ion .…”

Novel cyan‐emitting KBaScSi2O7:Eu2+ phosphors with ultrahigh quantum efficiency and excellent thermal stability for WLEDs

“…At present, the major WLEDs in practical application are dominated by the construction of a blue InGaN chip with a yellow Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) phosphor . Although this implementation has been broadly acknowledged, they are still suffering from low color rendering index (CRI; usually, <80) and high correlated color temperature (CCT; usually, >4500 K) due to the deficiency of the red component . The above‐mentioned drawbacks restrict their applications in more colorful usage.…”

Rare‐earth‐free Li5La3Ta2O12:Mn4+ deep‐red‐emitting phosphor: Synthesis and photoluminescence properties

“…As one of non‐rare‐earth activators for red‐emitting phosphors, Mn 4+ ion with 3 d 3 electron configuration is attracting considerable interest because it can show broad absorption band in the range from 220 to 570 nm and exhibit red or deep red emission in the region from 600 to 790 nm due to the 2 E→ 4 A 2 transition . Mn 4+ ion can usually be stable in octahedral environments and substitute for the Al 3+ , Sc 3+ , Ga 3+ , Ti 4+ , Si 4+ , Ge 4+ , Zr 4+ , Sn 4+ , Ta 5+ , Nb 5+ , Sb 5+ , Te 6+ , Mo 6+ , and W 6+ sites in octahedral cell and form the octahedral center in host lattice . The luminescence properties of Mn 4+ ‐doped phosphors can be affected by the co‐valency of the “Mn 4+ ‐ Ligand” bonding and the host crystal field environment.…”

“…12,13 Mn 4+ ion can usually be stable | 5911 CAO et Al. in octahedral environments and substitute for the Al 3+ , Sc 3+ , Ga 3+ , Ti 4+ , Si 4+ , Ge 4+ , Zr 4+ , Sn 4+ , Ta 5+ , Nb 5+ , Sb 5+ , Te 6+ , Mo 6+ , and W 6+ sites in octahedral cell and form the octahedral center in host lattice. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] The luminescence properties of Mn 4+ -doped phosphors can be affected by the co-valency of the "Mn 4+ -Ligand" bonding and the host crystal field environment. Up to now, there are two main kinds of hosts for Mn 4+ doping, such as fluorides and oxides.…”