Zero-thermal-quenching of Mn4+ far-red-emitting in LaAlO3 perovskite phosphor via energy compensation of electrons’ traps

et al. 2021

J Am Ceram Soc.

The exploration of the high thermal stability near‐infrared (NIR) phosphors is significantly crucial for the development of plant lighting. However, NIR phosphors suffer from the poor chemical and thermal stability, which severely limits their long‐term operation. Here, the successful improvement of luminous intensity (149.5%) and thermal stability at 423 K of Zn3Ga2GeO8 (ZGGO): Cr3+ phosphors is achieved for the introduction of Al3+ ions into the host. The release of carriers in deep traps inhibits the emission loss for the thermal disturbance. Furthermore, an NIR light emitting diodes (LEDs) lamp is explored by combining the optimized Zn3Ga1.1675Al0.8GeO8: 0.0325Cr3+ phosphors with a commercial 460 nm blue chip, and the emission band can match well with the absorption bands of photosynthetic pigments and the phytochrome (PR and PFR) of plants. The explored LEDs lamp further determines the growth and the pheromone content of the involved plants for the participation of the NIR emission originated from Cr3+ ions. Our work provides a promising NIR lamp as plant light with improved thermal stability for long‐term operation.

Section: Introductionmentioning

confidence: 99%

Improved thermal stability of the near‐infrared Al‐modulated Zn₃Ga₂GeO₈: Cr³⁺ phosphors for plant growth applications

Liu

et al. 2021

J Am Ceram Soc.

“…A far-red-emitting LaAlO 3 :3%Ca 2+ ,1%Bi 3+ ,0.1%Mn 4+ perovskite phosphor shows a zero-TQ property even up to 150 °C, which is caused by the efficient ET, energy compensation, and the enhancement of structural rigidity. [35] This phosphor has a good application prospect for improving plant seed germination, flowering, fruiting, and aging. Very recently, Wu et al reported NaZn(PO 3 ) 3 :Mn 2+ (NZP:Mn 2+ ), which is free from TQ until 250 °C (Figure 4c).…”

Section: P-6s Transition (Bi 3+ )mentioning

confidence: 99%

How to Obtain Anti‐Thermal‐Quenching Inorganic Luminescent Materials for Light‐Emitting Diode Applications

Dang

Advanced Optical Materials

Lian

et al. 2022

128

phosphor-converted light-emitting diodes (pc-LEDs) have been widely used in solidstate lighting, backlighting, near-infrared (NIR) light sources, etc. [1] As an important component in pc-LED devices, phosphors have been developed rapidly because of their attractive and tunable optical properties. Photoluminescence (PL) thermal stability of phosphor materials is evaluated by the thermal quenching (TQ) behavior, which is related to the electronic/crystal structure, structural rigidity, and chemical composition of phosphors. [2] To achieve high brightness, high-power LED chips that operate at high currents are usually required. In this case, a large amount of heat will lead to a high temperature on the surface of chips. This heat activates more

“…Mechanism of the effect has been discussed in some reports, 24,[41][42][43][44][45] and was suggested that the electrons of phosphor gain energy supply from the electron trap produced by the defect of the matrix with the increase of temperature, and then the effect is induced.…”

Section: Luminescent Thermal Stabilitiesmentioning

confidence: 99%

Formation and enhancement of negative thermal quenching in emission of KGdF₄:Eu³⁺, Yb³⁺@GQDs

Chang

et al. 2021

RSC Adv.