Synthesis and photoluminescence of green-emitting Ce³⁺,Tb³⁺ co-doped Al₆Si₂O₁₃ phosphors with high thermal stability for white LEDs

Abstract

In this article, novel green-emitting Ce3+, Tb3+ co-doped Al6Si2O13 phosphors with good thermal stability have been successfully prepared by high-temperature solid-state reaction method.

Preparation, characterization, and luminescence properties of double perovskite SrLaMgSbO6:Mn4+ far-red emitting phosphors for indoor plant growth lighting

“…7 shows the Tanabe-Sugano energy level diagram of d 3 electron conguration for Mn 4+ in the octahedral crystal led. Apparently, in an octahedral environment, the ground state 4 A 2g and excited state 4 T 1g and 4 T 2g were split by the 4 F term, and the excited state 2 T 2g and 2 E g were derived from the 2 G term. 39,68 The levels of 4 T 1g , 4 T 2g , 2 T 2g , and 2 E g made up the important energy levels for Mn 4+ ions to emit far-red light in an octahedral environment.…”

“…Nowadays, an intense research effort has recently been devoted to developing red-emitting phosphors for phosphorconverted light-emitting diodes (pc-LEDs), due to the fact that pc-LEDs, which show many merits including high durability, low energy consumption, short response time, and environmental protection, can be used in indoor plant cultivation, decoration, and medical applications. [1][2][3][4][5][6][7][8][9] For the indoor plant growth, the growth status can be controlled by adjusting the ratio of the phytochrome P R and P FR , because the P FR can convert to P R by absorbing far-red light centered at 730 nm. 10,11 But in the agricultural industry, especially indoor plant cultivation, there is lack of far-red light to meet the requirement of mutual transformation between the phytochrome P FR and P R due to small percentage of far-red light in the sunlight compared to red light.…”

Low‐cost inkjet printing of thin‐film mullite structures

“…Secondly, the pH was kept close to 2, thus, reducing the aggregation of the alumina-silica particles. 19,15 Moreover, the ink was filtered with a 0.2 μm 1.…”

“…properties, 11 and it can be readily prepared by various methods, including sol-gel processing, a wet-chemical low-temperature synthetic route that generates products with high purity and homogeneity. 12 Mullite is accepting a wide variety of elements into the structure, for example, enabling color-tuneable phosphors in the visible 13 and near infra-red range 14 such as for LED fabrication with high color rendering index and extraordinary thermal quenching characteristics up to ∼260 • C. 15 Ink-jet printing is a commodity technology with many commercial and affordable printers available on the market. A bottleneck for a wider-spread implementation of high-performance professional printing of functional material structures, however, is related to the disposable cartridges and further utilization of high-cost consumables.…”

Nanoparticle and Solution Doping for Efficient Holmium Fiber Lasers

“…A comprehensive review can be found in [50]. The maximum rare-earth concentration in the mullite phase was published by Wang et al [51] in the case of terbium-doped mullite. Based on their data, the optimized composition contained 8 mol.% of Tb 3+ which gives the Al/Tb ratio equal to 75.…”