With superior photoluminescent properties, the recently discovered A2MF6:Mn4+ material holds potential in replacing commercial rare-earth-doped (oxy)nitride phosphors for solid state lighting and display. We report here a green synthetic route to synthesize narrow red emitting K2SiF6:Mn4+ without usage of toxic volatile HF solution. show that is produced common low-toxic H3PO4/KHF2 liquid instead high-toxic systematically investigate its morphology photoluminescence properties. Moreover,...

Poor water resistance and nongreen synthesis remain great challenges for commercial narrow red-emitting phosphor A2MF6:Mn4+ (A = alkali metal ion; M Si, Ge, Ti) solid-state lighting display. We develop here a simple green growth route to synthesize homogeneous composite K2SiF6:Mn4+@K2SiF6 (KSFM@KSF) with excellent high efficiency without the usage of toxic volatile hydrogen fluoride solution. After immersing into 6 h, as-obtained water-resistant products maintain 76% original emission...

A novel red emitting fluoride phosphor, K₂LiAlF₆:Mn⁴⁺, with an excellent thermal quenching behavior and color stability for white LEDs is developed by a green synthetic route based on low-toxic H₃PO₄/KHF₂liquid instead of the highly toxic HF liquid.

With admirable luminescence performance and a cheap price, non-rare-earth-based oxide red phosphors are potential competitor of rare-earth-doped for warm white LEDs (WLEDs). Herein, novel double-perovskite Ba2GdSbO6:Mn4+ phosphor, demonstrating strong emission ascribed to spin-forbidden Mn4+:2Eg → 4A2g transition in the region 620-750 nm, has been synthesized via solid-state reaction route. The microstructure properties investigated detail. concentration quenching mechanism thermal stability...

Non-rare-earth Mn4+-doped double-perovskite (Ba1- xSr x)2YSbO6:Mn4+ red-emitting phosphors with adjustable photoluminescence are fabricated via traditional high-temperature sintering reaction. The structural evolution, variation of Mn4+ local environment, luminescent properties, and thermal quenching studied systematically. With elevation Sr2+ substituting content, the major diffraction peak moves up to a higher angle gradually. Impressively, increasing substitution Ba2+ cation from 0 100%,...

A novel red-emitting fluoride phosphor, K₂NaAlF₆:Mn⁴⁺, with nanoscale particle size was synthesized<italic>via</italic>a cation exchange route.

Owing to its low-cost and satisfactory luminescent-emission performance in warm white light-emitting diodes (w-LEDs), the non-rare-earth Mn4+-activated red phosphor has become a promising competitor of commercial rare-earth doped phosphor. In this study, series novel red-light emitting phosphors based on Ca2YSbO6:Mn4+ have been developed successfully by conventional solid-state reaction. The structural luminescent properties these are systematically investigated. as-prepared product exhibits...

Tunable luminescence in Eu 3+ /Sm single-doped self-activated fluorescent materials for optical thermometry and anti-counterfeiting.

Multicolor tunable and high sensitivity optical thermometry was realized by introducing Al 3+ ions to occupy Ga sites in Bi ,Sm co-doped Sr 2 GdGa 1− z O 5 phosphor.

BaTiF₆:Mn⁴⁺: a fluoride-based red phosphor with sharp emission line and broad absorption in the blue region used for warm WLEDs.

Mn⁴⁺-Doped red fluoride phosphors have attracted significant interest of researchers because their excellent luminescence properties that can address the issue lack light components in commercial white light-emitting-diodes (WLEDs).

Yb/Ln/Mn:Na₃ZrF₇ phosphors with bi-functional luminescence are fabricated <italic>via</italic> an oil–water interface cation exchange, enabling them to be applied in anti-counterfeiting.

A highly efficient La₂Li_1−ySb_1−xO₆:<italic>x</italic>Mn⁴⁺,<italic>y</italic>Mg²⁺ red phosphor with enhanced photoluminescence and the corresponding PiG-based high-power warm w-LEDs were investigated.

Abstract Achieving continuous tunability, high efficiency, and outstanding thermal stability of near‐infrared (NIR) phosphors remains challenging for optoelectronic device fields. To address this issue, a strategy is proposed based on the substitution both cations anions in intermediate spinel structure, which successfully achieved fine‐tuning NIR emission Mg 1+y Ga 2‐y O 4‐y F y :Fe 3+ with prominent optical characteristics. The contains new luminescent centers random O/F coordination...

The novel red phosphor K₂LiGaF₆:Mn⁴⁺, which exhibits a broadband excitation extending from 300 to 500 nm and an ideal narrow band emission centered at 630 nm, is promising candidate for application in WLEDs.

Abstract Owing to the conventional phosphor‐converted white LEDs (pc‐WLEDs) generally suffer from blue‐green cavity, thus, developing an appropriate phosphors covering both blue and green regions in their emission spectra are very urgent. Herein, a novel Sc silicate phosphor, KBaScSi 2 O 7 :Eu 2+ (KBSS:Eu ), has been successfully designed prepared via solid‐state reaction. The crystal structure, luminescent properties, thermal quenching, quantum efficiency as well its application UV‐pumped...

Chlorine-promoted doping of Mn(<sc>ii</sc>) in CsPbCl₃ perovskites is achieved by employing manganese acetate as a precursor for the first time.

Modulating the crystal field environment around emitting ions is an effective strategy to improve luminescence performance of practical phosphor materials. Here, smaller Y3+ are introduced into substituting Gd3+ sites in Ba2GdNbO6:Mn4+ modify optical properties, including enhanced intensity, redshift, and longer lifetime Mn4+ ions. The substitution leads lattice contraction then strengthens pressure on local structure, enhances rigidity, suppresses nonradiative transition. Moreover,...

β-NaYF4 nanocrystal embedded glass ceramics were fabricated by a melt-quenching method with subsequent heat-treatment. Structural characterizations and spectrographic techniques performed to verify the successful precipitation of nanocrystals partition dopants. Upon excitation 980 nm, bright green upconversion emission could be achieved in Yb3+, Er3+ codoped ceramics. Furthermore, temperature-dependent behaviour based on thermally coupled energy levels was also examined range 300-773 K...

Micro-LED technology is an advanced that can achieve high-resolution display in micron level pixels. The "phosphor-converted" mode the most promising way to promote micro-LED applications, and efficient nanoscale fluorescent materials are of great importance. LED-used narrow-band red-emitting Mn4+ doped fluorides commercialized worldwide have excellent luminescent properties, but they lack effective nanosynthesis method experience difficulty meeting patterning requirements a display. Herein,...

Tin-based perovskites are becoming promising alternatives to lead-based with eco-friendly merit and tantalizing photophysical properties. Unfortunately, the lack of facile, low-cost synthesis approaches associated extremely poor stability greatly restrict their practical applications. Herein, a facile room-temperature "coprecipitation" method utilizing ethanol (EtOH) solvent salicylic acid (SA) additive is proposed for synthesizing highly stable cubic phase CsSnBr3 perovskite. Experimental...

Using Li + co-doping for charge compensation, the broadband NIR luminescence intensity was enhanced. Compared with K 2 ZnF 4 :Cr 3+ , emission of ,Li increased 2.58 times. A high-power LED device realized.