Dual‐Shelled RbLi(Li₃SiO₄)₂:Eu²⁺@Al₂O₃@ODTMS Phosphor as a Stable Green Emitter for High‐Power LED Backlights

Abstract

The stability of luminescent materials is a key factor for the practical application in white light‐emitting diodes (LEDs). Poor chemical stability of narrow‐band green‐emitting RbLi(Li3SiO4)2:Eu2+ (RLSO:Eu2+) phosphor hinders their further commercialization even if they have excellent stability against thermal quenching. Herein, we propose an efficient protection scheme by combining the surface coating of amorphous Al2O3 and hydrophobic modification by octadecyltrimethoxysilane (ODTMS) to construct the moisture‐resistant dual‐shelled RLSO:Eu2+@Al2O3@ODTMS composite. The growth mechanisms of both the Al2O3 inorganic layer and the silane organic layer on the phosphor surface are investigated. The results remarkably improve the water‐stability of this narrow‐band green emitter. The evaluation of the white LED by employing this composite as the green component demonstrates that RLSO:Eu2+@Al2O3@ODTMS is a promising candidate for the high‐performance display backlights, and this dual‐shelled strategy provides an alternative method to improve the moisture‐resistant property of humidity‐sensitive phosphors.

Facile Construction and Fabrication of a Superhydrophobic and Super Oleophilic Stainless Steel Mesh for Separation of Water and Oil

“…In particular, it needs to be mentioned that the growing of Fe 2 O 3 -NCs on SSM after immerging-burning treatment is beneficial to the coating of OTS on the surface of Fe 2 O 3 -NCs@SSM, which will enhance the superhydrophobic property of the material. Additionally, OTS can be used to grow a compact and self-assembled monolayer with low surface energy on the surface of Fe 2 O 3 -NCs@SSM, leading to an improvement in the hydrophobicity of the sample [ 37 , 38 ].…”

Na Replaces Rb towards High‐Performance Narrow‐Band Green Phosphors for Backlight Display Applications

“…However, these experiments indicate that the chemical stability of R 4 LSO: 8%Eu 2+ and R 3 NLSO: 8%Eu 2+ still need to be further improved, which can be achieved by techniques such as surface modification. [ 39,40 ]…”

“…However, these experiments indicate that the chemical stability of R 4 LSO: 8%Eu 2+ and R 3 NLSO: 8%Eu 2+ still need to be further improved, which can be achieved by techniques such as surface modification. [39,40] For this reason, we used octadecyltrimethoxysilane (ODTMS) for surface modification of R 4 LSO: 8%Eu 2+ and R 3 NLSO: 8%Eu 2+ phosphors, to obtain R 4 LSO: 8%Eu 2+ @ODTMS and R 3 NLSO: 8%Eu 2+ @ODTMS. As shown in Figure 7a, to test the hydrophobic properties, all samples were poured directly into water.…”

Tuning crystal structure and luminescence of Eu2+-activated LiSr1–xBaxPO4 solid solution for white light-emitting diodes

“…Therefore, a large number of Eu 2+ -or Ce 3+ -activated phosphors with tunable emission color have been reported on the basis of different crystal structures. [7][8][9][10][11][12][13][14][15][16][17] The modification of crystal structures through solid solution is an efficient way to adjust the luminescent properties of Eu 2+ -or Ce 3+ -activated phosphors, which contains cationic replacement, (partial) anionic replacement, both cationic and anion group replacement, and etc. 6 These types of modification usually result in continuous shift of the emission band, due to continuous variation of coordination polyhedron.…”