Highly efficient Sr₃Y₂(Si₃O₉)₂:Ce³⁺,Tb³⁺/Mn²⁺/Eu²⁺phosphors for white LEDs: structure refinement, color tuning and energy transfer

Abstract

A series of highly efficient and emission-tunable Sr 3 Y 2 (Si 3 O 9 ) 2 (SYSO):Ce 3+ ,Tb 3+ /Mn 2+ /Eu 2+ phosphors have been prepared via a solid-state reaction. The structure refinement indicates that the as-prepared phosphors crystallized in a monoclinic phase with a space group of C2/c (no. 15), and there are three kinds of cation sites in the host lattice for the doped ions to occupy. The Ce 3+ emission at different lattice sites in the SYSO host has been firstly identified and discussed. When introducing other doping ions into these cation sites, there exist efficient energy transfers from Ce 3+ ions to these doping ions (Tb 3+ , Mn 2+ , and Eu 2+ ) under UV excitation. The corresponding energy transfer mechanisms from Ce 3+ to Tb 3+ /Mn 2+ /Eu 2+ in SYSO:Ce 3+ ,Tb 3+ /Mn 2+ /Eu 2+ systems have been studied systematically. These energy transfers not only can enhance the luminescent efficiencies and broaden the width of emission spectra of SYSO:Ce 3+ ,Tb 3+ /Mn 2+ /Eu 2+ phosphors but also can modulate their emission colors from blue to green, orange or cyan, respectively. For example, the maximum quantum yields (QYs) of as-prepared SYSO:0.15Ce 3+ ,xTb 3+ /yMn 2+ phosphors can reach 90.4% and 74% at x ¼ 0.70, y ¼ 0.01, respectively.Based on these experiment results, the as-prepared SYSO:Ce 3+ ,Tb 3+ /Mn 2+ /Eu 2+ phosphors can act as potential color-tunable and emission band-widened phosphors for possible applications in ultraviolet light based white LEDs.

Emerging cool white light emission from Dy3+ doped single phase alkaline earth niobate phosphors for indoor lighting applications

“…1,2 Among them, white light emitting diodes (w-LEDs) have been considered to be the next generation illumination sources in the field of solid-state lighting instead of traditional incandescent and currently implemented fluorescent lamps due to their numerous advantages such as small size, high energy efficiency, energy-saving, robustness, high brightness, fast switching, longer life time (>100 000 h) and environmental friendliness. [3][4][5] Currently, two approaches have been implemented to achieve white light through solid-state lighting (SSL).…”

Synthesis and luminescence properties of a bluish-green emitting phosphor Ba3(PO4)2: Ce3+, Tb3+

“…Second, rare earth ion pairs are commonly co-doped on account of energy transfer mechanism. Usually, Ce 3 þ -Tb 3 þ [14,15], Eu 2 þ -Mn 2 þ [16,17] and Ce 3 þ -Mn 2 þ [18] and so on are associated. The one that can absorb excitation energy and transfer part of it to the other one is called sensitizer, such as Ce 3 þ and Eu 2 þ .…”

Новый люминофор ИК-диапазона на основе германата Sr-=SUB=-3-=/SUB=-La-=SUB=-2-=/SUB=-(Ge-=SUB=-3-=/SUB=-O-=SUB=-9-=/SUB=-)-=SUB=-2-=/SUB=- : Nd-=SUP=-3+-=/SUP=-, Ho-=SUP=-3+-=/SUP=-

“…Особое место среди этих материалов занимают иттрийсодержащие силикаты кальция и строн-ция A 3 Y 2 (Si 3 O 9 ) 2 (A = Ca, Sr) [11][12][13][14][15][16][17]. Расположение активных центров на оптимальных для переноса энергии и заряда расстояниях (∼ 6.5 ¦ ) в этих соединениях обусловливает высокую интенсивность свечения с кван-товым выходом до 90% [15].…”

“…Особое место среди этих материалов занимают иттрийсодержащие силикаты кальция и строн-ция A 3 Y 2 (Si 3 O 9 ) 2 (A = Ca, Sr) [11][12][13][14][15][16][17]. Расположение активных центров на оптимальных для переноса энергии и заряда расстояниях (∼ 6.5 ¦ ) в этих соединениях обусловливает высокую интенсивность свечения с кван-товым выходом до 90% [15]. К настоящему времени на основе этих оптических матриц, активированных Tb 3+ , Eu 2+ , Mn 2+ , Dy 3+ , Ce 3+ , получены люминофоры синего, желтого, зеленого и белого свечения [12][13][14][15][16].…”