Stable and efficient phosphor systems for white light-emitting diodes (LEDs) are highly important with respect to their application in solid-state lighting beyond the technical limitations of traditional technologies. Therefore, inorganic conversion phosphors must be precisely selected evaluated regard special material properties synergistic optical parameters. In this perspective, we present an overview recent developments LED phosphors; firstly, general photoluminescence-controlling...

Site preferences of dopant Eu2+ on the locations K+, Ba2+, and Ca2+ in mixed cation phosphate K2BaCa(PO4)2 (KBCP) are quantitatively analyzed via a combined experimental theoretical method to develop blue-emitting phosphor with thermally stable luminescence. ions located at K2 (M2) K3 (M3) sites KBCP, latter occupation relatively more than former, corresponding emissions 438 465 nm, respectively. KBCP:Eu2+ exhibits highly thermal luminescence even up 200 °C, which is interpreted as due...

The discovery of high efficiency narrow-band green-emitting phosphors is a major challenge in backlighting light-emitting diodes (LEDs). Benefitting from highly condensed and rigid framework structure UCr4 C4 -type compounds, next-generation narrow green emitter, RbLi(Li3 SiO4 )2 :Eu2+ (RLSO:Eu2+ ), has emerged the oxide-based family with superior luminescence properties. RLSO:Eu2+ phosphor can be efficiently excited by GaN-based blue LEDs, shows emission at 530 nm full width half maximum 42...

Phosphor-converted white LEDs rely on combining a blue-emitting InGaN chip with yellow and red-emitting luminescent materials. The discovery of cyan-emitting (470-500 nm) phosphors is challenge to compensate for the spectral gap produce full-spectrum light. Na0.5K0.5Li3SiO4:Eu2+ (NKLSO:Eu2+) phosphor was developed impressive properties, providing cyan emission at 486 nm narrow full width half maximum (FWHM) only 20.7 nm, good thermal stability an integrated loss 7% 150 °C. ultra-narrow-band...

Stable double perovskite Cs₂AgInCl₆ has been reported as a direct gap semiconductor with wide band of 3.23 eV obtained experimentally and 3.33 by DFT calculation.

The union of structural and spectroscopic modeling can accelerate the discovery improvement phosphor materials if guided by an appropriate principle. Herein, we describe concept "chemical unit cosubstitution" as one such potential design scheme. We corroborate this strategy experimentally computationally applying it to Ca2(Al(1-x)Mg(x))(Al(1-x)Si(1+x))O7:Eu(2+) solid solution phosphor. cosubstitution is shown be restricted tetrahedral sites, which enables tuning luminescent properties....

The control of surface properties all inorganic cesium lead halide perovskite (CsPbX3; X = Cl, Br, or I) quantum dots (QDs) is essential to achieve excellent stability and high photoluminescence yields (PLQYs). Herein, a facile method was performed simultaneously enhance the PLQYs CsPbX3 QDs by ZnX2/hexane solution post-treatment. We show that halogen defect on can be treated in controlled way, whereby "black dots" adhered as observed transmission electron microscopy have completely removed,...

Abstract Cr 3+ /Cr 4+ ‐activated near‐infrared (NIR) luminescent materials have attracted extensive attention owing to their tunable emission wavelength and widespread applications in plant growth, food analysis, biomedical imaging, night vision, so on. Plenty of excellent NIR are developed by introducing ion various inorganic hosts. Herein, the effect crystal field on luminescence combining Tanabe–Sugano energy level diagram configuration coordinate model is discussed. Research progress...

A Cr³⁺-doped halide double perovskite Cs₂AgInCl₆:Cr³⁺ is first reported which exhibits a broad near-infrared emission ranging from 850 to 1350 nm centered at 1010 with FWHM of 180 nm.

Lead-free halide double perovskites continue to draw increasing attention in view of their nontoxicity and stability compared lead-based perovskites. Herein, we optimized the colloidal synthesis undoped Bi-doped Cs2AgInCl6 nanocrystals (NCs) via facile hot-injection process using nontoxic available precursors. The conditions including temperature, ligands, hydrochloric acid are investigated boost photoluminescence quantum yield (PLQY) Cs2AgInCl6:Bi NCs with trace amount Bi doping. broad-band...

This review summarizes previous research on luminescent perovskites, including oxides and halides, with different structural dimensionality. The relationship between the crystal structure, electronic structure properties is discussed in detail.

The stability issue of organometallic halide perovskites remains a great challenge for future research as to their applicability in different functional material fields. Herein, novel and facile two-step synthesis procedure is reported encapsulation CH3NH3PbBr3 perovskite quantum dots (QDs) MOF-5 microcrystals, where PbBr2 CH3NH3Br precursors are added stepwise fabricate stable CH3NH3PbBr3@MOF-5 composites. In comparison QDs, composites exhibited highly improved water resistance thermal...

Abstract Learning from natural mineral structures is an efficient way to develop potential host lattices for applications in phosphor converted (pc)LEDs. A narrow‐band blue‐emitting silicate phosphor, RbNa 3 (Li SiO 4 ) :Eu 2+ (RNLSO:Eu ), was derived the UCr C ‐type model. The broad excitation spectrum (320–440 nm) indicates this can be well matched with near ultraviolet (n‐UV) LED chip. Owing highly condensed and rigid framework, RNLSO:Eu exhibits extremely small Stokes shift unprecedented...

LaMgGa₁₁O₁₉:Cr³⁺ phosphor was synthesized successfully, showing broadband NIR emission centered at ∼770 nm, high efficiency and excellent thermal quenching resistance for pc-LEDs.

Local structure modification in solid solution is an essential part of photoluminescence tuning rare earth doped state phosphors. Herein we report a new phosphor Eu2+-doped xSr2Ca(PO4)2–(1 – x)Ca10Li(PO4)7 (0 ≤ x 1), which share the same β-Ca3(PO4)2 type full composition range. Depending on parameter variation x)Ca10Li(PO4)7:Eu2+, vacancies generated M(4) site enable nonlinear cell parameters and volume, this increases magnitude M(4)O6 polyhedra distortion. The local modulation around Eu2+...

A codoping strategy is advanced to improve luminescence efficiency, emission color tuning, and thermal stability of LED phosphors.

Abstract The halide double perovskite family represented by A 2 (B + ,B 3+ )X 6 can overcome the lead toxicity and enable generally large band gap engineering via B/B sites' transmutation or exotic dopants to fulfill emerging applications in optoelectronic fields. Herein, design experimental synthesis of a new Mn 2+ ‐doped Cs NaBi 1‐ x In Cl crystals with an intense orange‐yellow emission are reported, phase formation stability is discussed combined experimental–theoretical approach....

The increasing demands for optical anti-counterfeiting technology require the development of versatile luminescent materials with multiple models and tunable photoluminescence. Herein, combination perovskite nanocrystals lanthanide-based metal–organic frameworks (Ln-MOFs) has been developed to offer such a high-tech solution. hybrid have fabricated via encapsulation CH3NH3PbBr3 in europium-based (Eu-MOFs) they display multistage behavior. CH3NH3PbBr3@Eu-MOF hybrids were two-step process,...

Controlled photoluminescence tuning is important for the optimization and modification of phosphor materials. Herein we report an isostructural solid solution (CaMg)x(NaSc)1-xSi2O6 (0 < x 1) in which cation nanosegregation leads to presence two dilute Eu(2+) centers. The distinct nanodomains (CaMg)Si2O6 (NaSc)Si2O6 contain a proportional number ions with unique, independent spectroscopic signatures. Density functional theory calculations provided theoretical understanding indicated that...

Trivalent chromium ion-doped near-infrared (NIR) phosphors have been widely studied due to their tunable emission wavelengths and broad applications. High Cr3+ concentration can improve absorption efficiency but generally results in low intensity the quenching effect. Herein, we report a series of efficient NIR with suppressed quenching, Sr9M1–x(PO4)7:xCr3+ (M = Ga, Sc, In, Lu), showing broadband ranging from 700 1100 nm peaking at 850 upon 485 light excitation. The peak position is almost...

All inorganic cesium lead halide CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are generally considered to be sensitive and even decompose when exposed ambient humidity. Herein, we perform a well-controlled investigation of the effect postsynthetic water treatment as-prepared NCs on photoluminescence quantum yields (PLQYs) stability, one can find that surface defective layer dissolved into further separate supernatant hexane solution from water, which improves PLQYs CsPbCl3, CsPbBr3,...

Abstract A robust and stable narrow‐band green emitter is recognized as a key enabler for wide‐color‐gamut liquid crystal display (LCD) backlights. Herein, an emerging rare earth silicate phosphor, RbNa(Li 3 SiO 4 ) 2 :Eu 2+ (RN:Eu with exceptional optical properties excellent thermal stability, reported. The resulting RN:Eu phosphor presents narrow emission band centered at 523 nm full width half maximum of 41 stability (102%@425 K the integrated intensity 300 K). also shows high quantum...