Preparation of Y2O2S:Eu3+phosphors by a novel decomposition method

Luminescent properties of Eu3+-doped glass ceramics containing BaGdF5 nanocrystals under NUV-excitation for W-LEDs

“…Nowadays, most commercial red phosphors are based on Eu 3+ doped sulfides and oxysulfides such as Y 2 O 2 S:Eu 3+ and SrY 2 S 4 :Eu 3+ [7,8]. However, some drawbacks of these phosphors are low luminous efficiency, short lifetimes and poor chemical stability, which limit their practical applications.…”

Li6Sr(La1−xEux)2Sb2O12(0<x≤1.0) solid-solution red phosphors for white light-emitting diodes

“…In order to solve such problem, another approach is proposed by combining the red/green/blue tri-color phosphors with the near-ultraviolet (n-UV) chip peaking at 370-410 nm or conjunction with green and red phosphors by using blue chip, which can offer higher CRI and excellent color uniformity [1,7]. However, the current commercial red phosphors are mainly sulfides and nitrides such as Y 2 O 2 S:Eu 3 þ [8], CaAlSiN 3 :Eu 2 þ [9], and Ba 2 Si 5 N 8 : Eu 2 þ [10], which still limited their applications extensively due to the chemical instability and rigorous synthetic routes. Therefore, it is highly urgent and desirable to develop novel and stable red phosphors.…”

Changes in the moisture stability of CaS:Eu2+ phosphors with surface coating methods

“…[1][2][3][4][5][6][7][8][9][10] In particular, white LEDs fabricated from phosphors are gaining significant attention because they have many advantages over the existing incandescent lamps. [6][7][8][9][10][11][12] Even though a blue light GaN (gallium nitride) LED chip loaded with a yellow phosphor is now widely used as a conventional white LED, this combination have serious drawbacks in the color rendering index. Because of this, the white LEDs based on red, green, and blue primary colors have been explored.…”

“…[3][4][5][6][7][8][9][10][11] Since the photoluminescence (PL) intensity of the red phosphor is lower than that of the green and blue phosphors, the use of a phosphor mixture containing a large amount of red phosphors is required for sufficient color rendering. [8][9][10] The alkaline earth sulfides are widely used as the red emitting phosphors. Among the red phosphors, CaS:Eu 2+ is considered as the most promising red emitting phosphor because of its a deep red emission with nice color purity.…”

“…Among the red phosphors, CaS:Eu 2+ is considered as the most promising red emitting phosphor because of its a deep red emission with nice color purity. [9][10][11][12][13] However, the application of CaS:Eu 2+ has been limited by their instability when exposed to moisture. The problems with red phosphors should be solved for the advancement of white LEDs.…”