We have already reported orangish yellow Caα-SiAlON:Eu2+ phosphors, and applied them to fabricate warm white light-emitting diodes (LEDs). In this letter, we report on greenish yellow Liα-SiAlON:Eu2+ phosphors, and use them to create daylight when coupled to an InGaN blue LED chip (460nm). The newly discovered Liα-SiAlON:Eu2+ phosphors emit at shorter wavelengths of 573577nm under the 460nm excitation, and exhibit a smaller Stokes shift than Caα-SiAlON:Eu2+ does. By using this short-wavelength yellow oxynitride phosphor, bright daylight emissions from white LEDs can be generated. Thus, highly efficient white LEDs with tunable white light can be fabricated with α-SiAlON:Eu2+ phosphors, enabling them for a wider range of applications.

1.
S.
Nakamura
and
G.
Fasol
,
The Blue Laser Diode: GaN Based Light Emitters and Lasers
(
Springer
, Berlin,
1997
).
2.
Y.
Sato
,
N.
Takahashi
, and
S.
Sato
,
Jpn. J. Appl. Phys., Part 2
35
,
L838
(
1996
).
3.
Y.
Narukawa
,
I.
Niki
,
K.
Izuno
,
M.
Yamada
,
Y.
Murazaki
, and
T.
Mukai
,
Jpn. J. Appl. Phys., Part 2
41
,
L371
(
2002
).
4.
Y. D.
Huh
,
J. H.
Shim
,
Y.
Kim
, and
Y. R.
Do
,
J. Electrochem. Soc.
150
,
H57
(
2003
).
5.
C. W.
Tang
,
S. A.
Van Slyke
, and
C. H.
Chen
,
J. Appl. Phys.
65
,
3610
(
1989
).
6.
H. A.
Hoppe
,
H.
Lutz
,
P.
Morys
,
W.
Schnick
, and
A.
Seilmeier
,
J. Phys. Chem. Solids
61
,
2001
(
2000
).
7.
J. W. H.
van Krevel
,
J. W. T.
van Rutten
,
H.
Mandal
,
H. T.
Hintzen
, and
R.
Metselaar
,
J. Solid State Chem.
165
,
19
(
2002
).
8.
R.-J.
Xie
,
M.
Mitomo
,
K.
Uheda
,
F.-F.
Xu
, and
Y.
Akimune
,
J. Am. Ceram. Soc.
85
,
1229
(
2002
).
9.
R.-J.
Xie
,
N.
Hirosaki
,
M.
Mitomo
,
Y.
Yamamoto
,
T.
Suehiro
, and
K.
Sakuma
,
J. Phys. Chem. B
B108
,
12708
(
2004
).
10.
R.-J.
Xie
,
N.
Hirosaki
,
K.
Sakuma
,
Y.
Yamamoto
, and
M.
Mitomo
,
Appl. Phys. Lett.
84
,
5404
(
2004
).
11.
N.
Hirosaki
,
R.-J.
Xie
,
K.
Kimoto
,
T.
Sekiguchi
,
Y.
Yamamoto
,
T.
Suehiro
, and
M.
Mitomo
,
Appl. Phys. Lett.
86
,
211905
(
2005
).
12.
K.
Sakuma
,
K.
Omichi
,
N.
Kimura
,
M.
Ohashi
,
D.
Tanaka
,
N.
Hirosaki
,
Y.
Yamamoto
,
R.-J.
Xie
, and
T.
Suehiro
,
Opt. Lett.
29
,
2001
(
2004
).
13.
K.
Sakuma
,
N.
Hirosaki
,
N.
Kimura
,
M.
Ohashi
,
R.-J.
Xie
,
Y.
Yamamoto
,
T.
Seuhiro
,
K.
Asano
, and
D.
Tanaka
,
IEICE Trans. Electron.
E88-C
,
2057
(
2005
).
14.
M.
Yamada
,
T.
Naitou
,
K.
Izuno
,
H.
Tamaki
,
Y.
Murazaki
,
M.
Kameshima
, and
T.
Mukai
,
Jpn. J. Appl. Phys., Part 2
42
,
L20
(
2003
).
15.
R.
Mueller-Mach
,
G.
Mueller
,
M. R.
Krames
,
H. A.
Hoppe
,
F.
Stadker
,
W.
Schinick
,
T.
Juestel
, and
P.
Schmidt
,
Phys. Status Solidi A
202
,
1727
(
2005
).
16.
J. C.
Park
,
H. K.
Moon
,
D. K.
Kim
,
S. H.
Byeon
,
B. C.
Kim
, and
K. S.
Suh
,
Appl. Phys. Lett.
77
,
2161
(
2000
).
You do not currently have access to this content.