Red-Emitting Phosphor Ba₉Lu₂Si₆O₂₄:Ce³⁺,Mn²⁺ with Enhanced Energy Transfer via Self-Charge Compensation

Abstract

A new red-emitting phosphor, Ce 3+ -Mn 2+ co-doped Ba 9 Lu 2 Si 6 O 24 was synthesized by using solid-state reactions. The phase formation, luminescence properties, energy transfer mechanisms and thermal stabilities were investigated. Under the near-ultraviolet excitation, Ba 9 Lu 2 Si 6 O 24 :Ce 3+ , xMn 2+ shows a tunable emission from blue-violet to red. When x = 0.08, the photoluminescence characterized a major peak at 610 nm with an internal quantum efficiency of about 70%. The energy transfer from Ce 3+ to Mn 2+ was further enhanced by self-charge compensation as a result of the presence of activators at different crystallographic sites simultaneously. At 160 ℃, the quantum efficiency retained 84% of that measured at roomtemperature. The small thermal quenching and efficient luminescence suggest that Ba 9 Lu 2 Si 6 O 24 :Ce 3+ , Mn 2+ is a promising candidate for use in ultraviolet chip pumped LEDs.

The cyan-green luminescent behaviour of nitrided Ba9Y2Si6O24: Eu2+ phosphors for W-LED

“…Hyun Cho et al [13] prepared Ba9Y2Si6O24: Eu 2+ phosphor and analyzed the luminescence properties, shown superior luminescence properties relative to Ba9Sc2Si6O24: Eu 2+ . Liu et al systematically studied the luminescence properties of Ba9M2Si6O24: N (N= earth element, M= Sc, Y, Lu), and proved the application prospect of phosphor in white LEDs [14,15]. But some unclear luminescent mechanism and shortcoming still exist in the aspect of luminous efficiencies and thermal stability compared to commercial YAG: Ce 3+ .…”

Dual-Mode Manipulating Multicenter Photoluminescence in a Single-Phased Ba9Lu2Si6O24:Bi3+, Eu3+ Phosphor to Realize White Light/Tunable Emissions

“…Silicate materials are inexpensive and readily available, and silicate-based phosphor materials serve as promising luminescent materials in the use of phosphor-converted w-LEDs because of their structural diversity, relatively easy preparation, good thermal stability, and visible light transparency 18,19 . Recently, a silicate-based phosphor Ba 9 Lu 2 Si 6 O 24 having an orthosilicate structure doped with various rare-earth ions has been extensively studied due to its favorable luminescence properties.…”

“…investigated the high thermal and radiation stability from Ce 3+ doped Ba 9 Lu 2 Si 6 O 24 green phosphor 7 ; Song et al . studied energy transfer in Ce 3+ , Mn 2+ co-doped Ba 9 Lu 2 Si 6 O 24 red phosphor 19 . It should be noted that the silicate-based phosphor Ba 9 Lu 2 Si 6 O 24 possesses multiple luminescent centers, as it contains three types of Ba centers and one type of Lu center.…”

Highly Stable Red‐Emitting Sr2Si5N8:Eu2+ Phosphor with a Hydrophobic Surface

“…In particular, the emission of LED chips is down‐shifted into useful green, yellow, or red light by phosphors. The phosphors used in solid‐state lighting technology must have proper photoluminescence (PL), high quantum efficiency, low thermal quenching, and high reliability …”

“…The phosphors used in solid-state lighting technology must have proper photoluminescence (PL), high quantum efficiency, low thermal quenching, and high reliability. [3][4][5][6][7][8] However, thermal-and moisture-induced luminescence degradation of phosphors occurs during conventional applications, significantly reducing the reliability and shortening the lifetime of white LEDs. 2,9 For instance, it is wellknown that thiogallate (SrGaS 4 :Eu) and sulfide (CaS:Eu and SrS:Eu) phosphors are unstable; 10,11 several silicate and aluminate phosphors also exhibit a similar problem, even (oxy)nitride phosphors, which are generally considered to be very stable, are moisture-sensitive, as well.…”