4 Z 4, pp. 373∼378
Er 3+ Ê Ý Yb 3+ T Æ X Øù p § Y 8 È X ¢ ZrO 2 x ¢] k ù° Ë Ñ= k8 ý Upconversion ] k ù° Ë Ñ ¤V R Ë ì Å
) ç
¸ · »( å V · L |A j* å · »^ ï BZ 9
1 l
x _ @ / < Æ § Ó ü t o < Æõ , Â Òí ß 614-714
{
¡g ` @Q · ' Ö <( å M · + ä ^ ï Bg ` @
Â
Ò â @ / < Æ § Ó ü t o < Æõ , Â Òí ß 608-737
(2011¸ 2 Z 4 16{ 9 ~ Ã Î6 £ §, 2011¸ 2 Z 4 28{ 9 Ã º& ñ : r ~ Ã Î6 £ §, 2011¸ 3 Z 4 27{ 9 > F S X & ñ )
3 mol% _ Er
3+ü < x mol% (x = 0, 5, 10, 15) _ Yb
3+s : r` ¦ ' ô Ç ZrO
2 ¸+ þ AF g ^ \ ¦ Ã º\ P ½ + Ë$ í Z O
Ü ¼ Ð ½ + Ë$ í # Yb
3+s : r s upconversion(UC) + þ AF g \ p u H % ò ¾ Ó` ¦ ¸ % i . SEM(scanning electron microscopy) õ X- r] X © ` ¦ ì r$ 3 # ZrO
2:Er
3+,Yb
3+ ¸ + þ AF g ^ H ½ ¨+ þ As 9 & ñ
~
½ Ó+ þ A_ & ñ ½ ¨ ¸\ ¦ s À Ò ¦ e 6 £ §` ¦ S X % i . 1 W, 975 nm & h ü @ Y Us $ s ¸× ¼ Ð # l # y
© ô Ç 0 l qÒ oõ & h Ò o_ UC + þ AF g` ¦ 8 £ ¤& ñ % i Ü ¼ 9 Yb
3+s : r _ 0 l x ¸\ ¦ 7 £ x r ( \ 0 l qÒ o + þ AF g \ q K
© @ /& h Ü ¼ Ð & h Ò o + þ AF g _ [ jl ß ¼> 7 £ x ÷ &% 3 . 0 l qÒ oõ & h Ò o UC + þ AF g _ * 3 á Ô F g [ jl _ > r` ¦ 8 £ ¤
&
ñ # q §ô Ç õ Yb
3+s : r _ ' Ð ô Ç Er
3+s : r s ~ ½ ÓØ ¦ H & h Ò o UC + þ AF g _ 7 £ x H H] X ô Ç Er
3+ü < Yb
3+s : r s \ µ 1 ÏÒ q tô Ç energy back transfer(
4S
3/2(Er
3+) +
2F
7/2(Yb
3+) →
4I
13/2(Er
3+) +
2F
5/2(Yb
3+)) õ & ñ \ l ¦ e 6 £ §` ¦ S X % i .
Ù þ
d # Q: t Ø Ô ïm , upconversion, + þ AF g, ¸+ þ AF g ^ , # QÂ Ó% 3
Upconversion Photoluminescence in ZrO 2 :Er 3+ ,Yb 3+ Nanophosphors
Samsik Sung · Byoung Kuk Kim · Haeyoung Choi · Jung Hwan Kim ∗
Department of Physics, Dongeui University, Busan 614-714
Hyeon Mi Noh · Byung Ki Moon · Jung Hyun Jeong
Department Physics, Pukyong National University, Busan 608-737 (Received 16 February 2011 : revised 28 February 2011 : accepted 27 March 2011)
Upconversion photoluminescence (UCPL) is investigated in ZrO
2:Er
3+, Yb
3+nanophosphors at different Yb
3+concentrations. The nanophosphors were synthesized by using the solvothermal method. The lattice structure for the tetragonal phase and the spherical shape of the nanophosphors were confirmed by using X-ray diffraction and scanning electron microscopy, respectively. The red UCPL under an excitation of 975 nm increased significantly with increasing Yb
3+concentration at room temperature. The pump-power dependence of the green and the red UCPL leads us to conclude that the red UCPL is enhanced by the energy back-transfer between Er
3+and Yb
3+ions (
4S
3/2(Er
3+) +
2F
7/2(Yb
3+) →
4I
13/2(Er
3+) +
2F
5/2(Yb
3+)).
PACS numbers: 78.51.-m
Keywords: ZrO
2, Upconversion, Luminescence, Er
3+, Yb
3+, Nanophosphor
∗
