Abstract The development of highly efficient and thermally stable broadband near‐infrared (NIR) luminescence materials is a great challenge to advance the next‐generation smart NIR light source. Benefitting from low phonon energy relatively weak electron coupling effect fluoride, K 2 NaScF 6 :Cr 3+ phosphor designed obtained, which demonstrates full width at half maximum 100 nm peaking ≈765 nm. Upon blue excitation, exhibits high quantum efficiency 74% its emission intensity 150 °C can keep...

A new generation of red phosphors complex fluoride matrices activated with Mn4+ has gained a broad interest in getting high color quality and low temperature solid-state white light-emitting diodes (WLEDs). However, besides their instability toward moisture, the extremely irregular nonuniform morphologies these have limited practical industry applications. In present study, novel type K3ScF6:Mn4+ phosphor highly regular, uniform, purity was obtained successfully through facile...

Upconversion (UC) luminescence materials doped with rare earth ions are extensively investigated as optical temperature probes by the fluorescence intensity ratio technique. However, most Er3+-doped still suffering from low sensing sensitivity. In present study, we attempt to develop high-sensing-sensitivity based on thermally coupled energy levels (TCLs) Stark sublevels well properties at subzero temperatures, for which there is continuous lack of research. Er3+/Yb3+ codoped Ba3Y4O9 (BYO)...

Abstract The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources emerging applications. Herein, a series hexafluorides A 2 BMF 6 :Cr 3+ (A = Na, K, Rb, Cs; B Li, M Al, Ga, Sc, In) peaking at ≈733–801 nm with full width half maximum (FWHM) ≈98–115 are synthesized by general ammonium salt assisted synthesis strategy. Benefiting from the pre‐ammoniation trivalent metal sources, Cr can be more efficiently doped...

Abstract Narrow‐band red‐emitting fluoride phosphors play a crucial role in lighting and backlight displays, whereas the stability issue is major challenge. Here, highly stable K 2 SiF 6 :Mn 4+ (KSFM) single crystal with tunable sizes (20–1000 µ m) are grown by facile saturated crystallization method. The small specific surface area together unique Mn ‐rare interface layer KSFM crystals enables simultaneous fulfillment of high external quantum efficiency, excellent moisture, improved thermal...

A novel Mn⁴⁺-doped double-perovskite red phosphor K₂NaScF₆:Mn⁴⁺ with ultra-high synthetic yield and uniform spherical morphology was developed for ultra-wide color gamut LCDs.

Transition metal Mn2+ ion activated luminescent materials with tunable visible emission and high color purity features are crucial for mondern lighting displays so forth. Herein, in contrast to the conventional of Mn2+, an olivine phosphor, Mg2GeO4:Mn2+, adjustable red (centered at ∼ 650 nm)/NIR at∼ 735 nm) emissions is demonstrated by doping ions into two different distorted octahedral MgO6 sites guided theory simulation. By varying content ions, red/NIR dual-wavelength a pure-NIR can be...

The discovery of high-efficiency Mn4+-activated fluoride red phosphors with short excited-state lifetimes (ESLs) is urgent and crucial for high-quality, wide-color-gamut display applications. However, it still a great challenge to design target both ESL high luminescence efficiency. Herein, we propose an efficient machine learning approach based on small dataset establish the prediction model, thereby facilitating new fluorides ESLs. Such model can not only accurately predict ESLs Mn4+ in...

A brand-new Mn⁴⁺-activated Cs₂NbOF₅ oxyfluoride phosphor was developed for light-emitting diode devices.

Abstract Spinel configuration is a kind of broadly considered host candidate when designing persistent luminescence (PersL) materials due to the easy generation vacancies and anti‐site defects. Here, new strategy defect enrichment for activation PersL proposed, in contrast spinel configuration, it demonstrated that crystal structure near inverse ensures more numerous defects activate near‐infrared (NIR) Fe 3+ . ‐doped MgGa 2 O 4 displays band range 600 900 nm possesses super‐long duration...

Abstract The design and discovery of Mn 4+ ‐activated fluoride phosphors that can secure both high luminescence efficiency short fluorescence lifetime simultaneously are crucial urgent for constructing high‐quality wide‐color gamut (WCG) backlight display applications. Herein, a series brand‐new narrow‐band red‐emitting with external quantum (EQE, >50%) (τ ≤ 3.8 ms) designed by introducing into newfound tetramethylammonium (Me 4 N)‐based organometallic N) 2 B F 6 ( = Ge, Ti, Zr) hosts....

Abstract Defects are a double‐edged sword for heterovalent metal‐ion doping phosphors. Along with the luminescence tunability of phosphors bestowed by defects, their expected efficiency would also be inevitably lowered due to presence these quenching sites. Herein, chemical group substitution strategy is proposed, where inorganic polyhedrons act as smallest units during structural evolution process. Such method can not only effectively prevent defect generation charge compensation in...

Mn4+ non-equivalent doped fluorides with high color purity red emission and relatively short decay time are crucial for wide gamut displays emerging applications, whereas the low quantum efficiency (QE) restrains their further applications. Herein, luminescence of fluoride K2NaAlF6:Mn4+ (KNAF:Mn4+) is significantly enhanced via a heterovalent co-doping strategy, where intensity obviously increased by ∼85%, but almost unchanged. The experimental characterization density functional theory...

Mn4+ activated fluorides are crucial for lighting and displays, owing to their unique narrowband red emission broadband blue light excitation. However, designing target phosphors that simultaneously possess appropriate...

The understanding and visualization of dipole–dipole interaction on molecular scale are scientifically fundamental extremely interest. Herein, two new zero-dimensional (0D) Mn hybrids with aromatic head groups alkyl tails as organic spacers selected models. It was found that the dipole between blocks could have a huge impact their crystalline structures well luminescent properties. parallel-oriented dipoles MnBr42– contribute to an efficient Förster Resonance Energy Transfer (FRET) in...

Abstract Owing to the avoidance of device reabsorption and improvement in color rendering index (CRI), Mn 4+ ‐activated fluorides have potential applications full‐spectrum lighting. However, it is still challenging improve external quantum efficiency (EQE) adapt excitation violet‐light chips used for increasing CRI reducing blue‐light hazard. Here, red‐light single crystals Rb 2 Si 1− x F 6 (RSMF) with an ultrahigh optimal content 32.4 mol% are obtained through structural morphological...