Phosphor for white light-emitting device and white light-emitting device including the same
View Patent ↗Provided are an alkaline earth metal silicate-based phosphor which is a compound represented by Formula 1 below, and a white light-emitting device (LED) including the same: (M1 1-x-y A x B y ) a Mg b M2 c O d Z e Formula 1 wherein, M1 is one selected from the group consisting of Ba, Ca, and Sr; M2 is at least one selected from Si or Ge; A and B are each independently one selected from the group consisting of Eu, Ce, Mn, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Bi, Sn, and Sb; Z is at least one selected from the group consisting of a monovalent or divalent element, H, and N; and 0<x<1, 0≦y≦1, 6.3<a<7.7, 0.9<b<1.1, 3.6<c<4.4, 14.4<d<17.6, 14.4<d+e<17.6, and 0≦e≦0.18. The alkaline earth metal silicate-based phosphor has a broad excitation wavelength range, and thus, both a UV-LED and a blue LED can be used as excitation sources for white LEDs. Furthermore, the total emission area of an emission spectrum of the alkaline earth metal silicate-based phosphor is greater than that of a common phosphor, thereby achieving better emission efficiency.
1. A white light-emitting device comprising;
a light source;
an alkaline earth metal silicate-based phosphor comprising a compound represented by Formula 1 below:
(M1 1-x-y A x B y ) a Mg b M2 c O d Z e Formula 1
wherein,
M1 is one selected from the group consisting of Ba, Ca, and Sr;
M2 is at least one selected from Si or Ge;
A and B are each independently one selected from the group consisting of Eu, Ce, Mn, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Bi, Sn, and Sb;
Z is at least one selected from the group consisting of a monovalent or divalent element, H, and N; and
0<x<1, 0≦y≦1, 6.3<a<7.7, 0.9<b<1.1, 3.6<c<4.4, 14.4<d<17.6, 14.4<d+e<17.6, and 0≦e≦0.18; and
a red phosphor having an emission peak wavelength of 590 to 690 nm,
wherein the light source is a light emitting device having an emission peak wavelength of 390 to 460 nm, and
the alkaline earth metal silicate-based phosphor has an emission peak wavelength of 500 to 550 nm.
2. The white light-emitting device of claim 1 , wherein the alkaline earth metal silicate-based phosphor has a bredigite structure.
3. The white light-emitting device of claim 1 , wherein the alkaline earth metal silicate-based phosphor comprises a compound represented by Formula 2 below:
(M1 1-x-y A x B y ) a Mg b M2 c O d Formula 2
wherein,
M1 is one selected from the group consisting of Ba, Ca, and Sr;
M2 is at least one selected from Si or Ge;
A and B are each independently Eu or Mn; and
0<x<1, 0≦y≦1, 6.3<a<7.7, 0.9<b<1.1, 3.6<c<4.4, and 14.4<d<17.6.
4. The white light-emitting device of claim 3 , wherein the alkaline earth metal silicate-based phosphor comprises (Ca 0.99 Eu 0.01 ) 7 MgSi 4 O 16 or (Ca 0.96 Eu 0.01 Mn 0.03 ) 7 MgSi 4 O 16 .
5. The white light-emitting device of claim 1 , wherein the light source is a LED chip.
6. The white light-emitting device of claim 1 , wherein the red phosphor is at least one selected from the group consisting of Y 2 O 3 :Eu 3+ ,Bi 3+ ; (Sr,Ca,Ba,Mg,Zn) 2 P 2 O 7 :Eu 2+ ,Mn 2+ ; (Ca,Sr,Ba,Mg,Zn) 10 (PO 4 ) 6 (F,Cl,Br,OH) 2 :Eu 2+ ,Mn 2+ ; (Gd,Y,Lu,La) 2 O 3 :Eu 3+ ,Bi 3+ ; (Gd,Y,Lu,La) 2 O 2 S :Eu 3+ ,Bi 3+ ; (Gd,Y,Lu,La)B O 3 :Eu 3+ ,Bi 3+ ; (Gd,Y,Lu,La)(P,V)O 4 :Eu 3+ ,Bi 3+ ; (Ca,Sr)S:Eu 2+ ; CaLa 2 S 4 :Ce 3+ ; (Ba,Sr,Ca)MgP 2 O 7 :Eu 2+ ,Mn 2+ ; (Y,Lu) 2 WO 6 :Eu 3+ ,Mo 6+ ; (Ba,Sr,Ca) x Si y N z :Eu 2+ (0.5≦x≦3.1, 5≦y≦8, 0<z<3), and (Sr,Ca,Ba,Mg,Zn) 2 SiO 4 :Eu 2+ ,Mn 2+ .