Themed collection FOCUS: Light-emitting diodes technology

Four design strategies for modulating the luminescence thermal quenching properties of Bi³⁺-activated phosphors are proposed: (1) defect engineering; (2) structural modulation; (3) lattice structure rigidity; and (4) energy transfer.

The introduction of an aza-triptycene unit with a Y-shaped rigid 3D molecular structure into tetradentate platinum(II) complexes helps to realize narrow-emitting and highly efficient OLEDs even at high doping concentrations.

Trimethylgallium, as a monomeric Ga precursor, promotes Ga incorporation into In_1−xGa_xP quantum dots, achieving efficient blue emission with the potential for electroluminescent applications.

A novel LaMgGa₁₁O₁₉:Cr³⁺,Yb³⁺ near-infrared broadband phosphor with high performance has been designed via a lattice occupation and energy transfer strategy. The application of the above phosphors in the LED field was also demonstrated.

The ultra-broadband emission spectrum of Mg₃Ga₂SnO₈:Cr³⁺ phosphor possesses excellent tunable properties. The emission peak and full width at half maximum can be continuously regulating by adjusting the concentration of Cr³⁺ ions.

The theoretical HRBE and VRBE scheme of Mg₃Y₂Ge₃O₁₂:Ln³⁺ phosphors were constructed and applications in X-ray imaging, anti-counterfeiting and information storage realized, providing a basis for the rational design of novel long persistent luminescence and storage phosphors.

The introduction of trimethylsilyl groups results in red-shifted emission, shorter decay times and higher PLQYs of the complexes.

This study presents a SiO₂-encapsulated white phosphor combining III-V nanocrystals and carbon dots. It offers broad-spectrum emission, uniform luminescence, and resolves reabsorption and phase issues, making it ideal for WLED applications.

A defect engineering strategy mediated by the structural cationic substitution is proposed and experimentally demonstrated for ultra-broadband emission in a garnet Y₃Sc₂Al₃O₁₂:B³⁺ phosphor.

Here, we report a new NIR emitter of Sb³⁺-doped tin(IV)-based metal halides via coordination structure modulation, which can exhibit bright broadband NIR emission under blue light excitation with a PLQY of 33.2%.

New ligand design provides reduction in ΔE_ST, suppression of aggregation, and a ∼4-fold increase in OLED EQE to 10%.

The anti-thermal quenching of Cr³⁺ is determined by the attribution of the defect level, which originates from the coupling between the doped ion Cr³⁺ and the V_O. NIR pc-LED achieves an NIR output power of 59.67 mW with working current of 150 mA.

Realizing efficient long-wavelength near-infrared (NIR) emission of Cr³⁺ ions is still a challenge in spinel-based phosphors due to the limitations of strong crystal fields.

The codoping of Ln³⁺ (Ln = Yb, Nd) in the Cs₂NaInCl₆:Sb³⁺ host not only produces PL components from visible to near-infrared regions, but also achieves a high near-infrared PLQY of ∼48.95%.

The crystal structure of Re⁴⁺ doped Cs₂ZrCl₆ and its application in the field of optical thermometry and IR imaging.

Optimal surface state regulation of CZTS can effectively passivate defects and minimize its direct contact with FAPbBr₃, which is significant for the enhancement of the performance of CZTS-based PeLEDs.

Utilizing the effective energy transfer from Cr³⁺ to Ni²⁺ to realize blue Light Excited Broadband NIR-II-emitting Li₂ZnSn₃O₈:Cr³⁺,Ni²⁺ Phosphor.

A series of Cr³⁺-activated near-infrared luminescent materials were successfully prepared by using [Zn²⁺-Ge⁴⁺] and [Ga³⁺-Ga³⁺] co-unit substitutions, with the peak luminescence tuned from 713 to 767 nm and the FWHM extended from 92 to 155 nm.

Sb³⁺/Sm³⁺ co-doping can effectively modulate the luminescence by adjusting the energy transfer in Cs₂NaYCl₆ double perovskites. Two minima in the excited state of ³P₁ enable the double self-trapped exciton emission at low temperatures.

R/S-PtAu₂ cluster enantiomers exhibit highly efficient narrow-band red emission with a FWHM of 25–29 nm as well as excellent chiral absorption and emission characteristics with a dissymmetry factor of ±1.0 × 10⁻³ for CPL and ±7 × 10⁻⁴ for CPEL.

An unprecedented disk-like Y₁₂ cluster with unique Y₂⊂Y₁₀ type structure was achieved successfully, which is the largest non-brucite type disk-like RE cluster and exhibits obvious electroluminescence performance in OLED device.

A sublimable Cu₄Br₄ cluster, chelated by bidentate N^P ligands with a donor–acceptor configuration, realizes highly efficient doped and non-doped cluster light-emitting diodes.

A comparative investigation of broadband near-infrared luminescence from two different occupation sites in Rb₂LiAlF₆:Cr³⁺ with high efficiency and excellent thermal stability.

Bi³⁺ ions occupy Ba site to form one Bi³⁺ luminescent center, which is consistent with the trigonal structure of BSAG. This phosphor has a high quantum efficiency of 95.3% and can be used in WLEDs.

The luminescence mechanism of Te⁴⁺-doped VODPs is reported. Te⁴⁺-doped Hf-based VODPs exhibit luminescence characteristics that are more in line with those of Te⁴⁺ ions, while Te⁴⁺-doped Sn- and Zr-based VODPs have STEs emission characteristics.

Two NHC-stabilized Cu₉ clusters showcase both TADF and direct phosphorescence in thermal equilibrium. The combined harvesting mechanism arises from the simultaneous presence of a small ΔE(S₁ − T₁) gap and relatively strong spin–orbit coupling.

Di-CF₃-functionalized benzo[d]imidazol-3-ium pro-chelates were employed in the selective syntheses of fac-coordinated Ir(III) carbene emitters for efficient blue electroluminescence and hyperphosphorescence.

Three rigid pyrimidine-4-carboxylic acid ligand-based iridium(III) complexes are developed with good electron mobility and the highest solution-processed device efficiency.

We develop a new type of violet-light-excitable Eu²⁺:Sr₈CaLu(PO₄)₇ phosphor with tunable green–yellow emissions and high photoluminescence quantum yields above 70% via Na⁺ alloying-induced local structural modification.

The highly doped phosphor La_0.827Al_11.9O_19.09:Mn²⁺ exhibits intense green emission with a narrow FWHM, high PL QY and excellent thermal stability, which confer great potential for wide-color gamut LCD backlight applications.

Reduced-dimensional (RD) metal halide perovskites (MHPs) have received much attention from scientific researchers for their highly tunable optoelectronic properties and solution processability.

To enhance near-infrared luminescence, we introduce Fe³⁺ and Yb³⁺ ions to Sr₉Ga(PO₄)₇ and utilize the structural confinement effect to selectively control energy transfer pathways so as to suppress luminescence concentration and thermal quenching.

Employing controllable monomers or excimers of sensitized ligands, homonuclear (Eu³⁺) and heteronuclear (Eu³⁺ and Tb³⁺) complexes were fabricated and have been applied in white LED lighting and dynamic anti-counterfeiting.

Embedding Si⁴⁺ or Ge⁴⁺ cations into the inert shell (K₂TiF₆) surrounding the K₂TiF₆:Mn⁴⁺ particle increases surface lattice covalence, significantly enhancing fluoride stability.

A single-phase white light phosphor, Gd₂Sr₃B₄O₁₂:Ce³⁺,Tb³⁺,Sm³⁺, with balanced and preferable comprehensive performances has been developed by energy transfer, suggesting its potential value in the applications of WLEDs.

Efficient and stable all-inorganic rubidium manganese halides are obtained via a new thermally induced fluorescence enhancement strategy, which exhibits red emission at 653 nm with a PLQY of 62.8%.

Multicolour LEDs and a self-calibrating partition thermometer are designed based on the excellent lanthanide compatibility of double perovskite La₂MgTiO₆.

A series of new Sb³⁺ doped-(DETA)InCl₆ organic–inorganic hybrid metal halide single crystals were synthesized. The PLQY of single crystals doped with 10% Sb was up to 100%, and white light emission was achieved when the Sb doping amount was 0.005%.

A new series of asymmetric four-membered chelating ring based geometric isomers of iridium complexes featuring three charged (0, −1, −2) ligands have been prepared. All isomers show effective deep-red emission and finally exhibit good OLED performance.

By partially introducing N³⁻ into a matrix, a new efficient and thermally stable Ba_0.697Al_10.914O_15.732N_1.0:0.16Eu²⁺ blue phosphor has been synthesized, which can better match with violet chips for full-spectrum lighting.

The aliovalent doping of Ce³⁺/K⁺ in α′-Sr₂SiO₄ leads to a thermally enhanced phosphor with bright blue emission, and electron traps modulated by defect engineering contribute to an abnormal thermal quenching phenomenon.

Enhanced and broadened NIR luminescence was realized in a Gd_2−xAl_xGaSbO₇:Cr³⁺ phosphor by Al³⁺ → Gd³⁺ cation substitution. Its application as an emitting converter for LEDs was confirmed.

A novel bright cyan-emitting phosphor of Eu²⁺-activated Ba₆BO₃Cl₉ with robust thermal stability has been reported. It can efficiently compensate for the lack of cyan emission and also contribute to the improvement in R_a of white LED devices.

Third-row transition-metal complexes displaying efficient true-blue (∼460–470 nm) and near infrared (∼700–1000 nm) emissions were strategically analyzed.