Red, green, and blue upconversion luminescence of trivalent-rare-earth ion-doped Y[sub 2]O[sub 3] nanocrystals

Matsuura, Daisuke
December 2002
Applied Physics Letters;12/9/2002, Vol. 81 Issue 24, p4526
Academic Journal
Trivalent-rare-earth ion-doped Y[sub 2]O[sub 3] nanocrystals have been synthesized, and their photoluminescence properties have been studied under 980 nm laser diode excitation. The crystallite size estimated by x-ray diffractometry and scanning electron microscopy was about 30-40 nm. In Yb[sup 3+] and Tm[sup 3+] codoped Y[sub 2]O[sub 3] nanocrystals, the bright blue emissions near 450 and 480 nm have been noticeable due to the ¹D[sub 2]-³F[sub 4] and ¹G[sub 4]-³H[sub 6] transitions of Tm[sup 3+], respectively. The bright green emissions of Er[sup 3+] doped Y[sub 2]O[sub 3] nanocrystals appeared near 530 and 550 nm were assigned to the ²H[sub 11/2]-[sub 4]I[sub 15/2] and [sup 4]S[sub 3/2]-[sup 4]I[sub 15/2] transitions of Er[sup 3+], respectively. The ratio of the intensity of green luminescence to that of red luminescence has decreased with an increase of concentration of Yb[sup 3+] in Er[sup 3+] doped Y[sub 2]O[sub 3] nanocrystals. In sufficient quantities of Yb[sup 3+] to Er[sup 3+], the bright red emission near 660 nm has been predominant due to the [sup 4]F[sub 9/2]-[sup 4]I[sub 15/2] transition of Er[sup 3+]. The primary color components are in these red, green, and blue emissions, from which a wide spectrum of colors, including white, would be produced by appropriate mixing them.


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