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Concentration enhanced red upconversion in nanocrystalline ZrO2 : Er under IR excitation

被引：42
作者：
Díaz-Torres, LA
De la Rosa-Cruz, E
Salas, P
Angeles-Chavez, C
机构：
[1] Ctr Invest Opt AC, Leon 37000, Gto, Mexico
[2] Inst Mexicano Petr, Mexico City 07730, DF, Mexico
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2004年 / 37卷 / 18期
关键词：
D O I：
10.1088/0022-3727/37/18/004
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The effects of Er3+ concentration in ZrO2 on the red (680 nm) and green (545 nm) upconversion emission from Er3+ under near infrared radiation (NIR) excitation (at both 1438 and 962 nm) are presented. For the highest Er3+ concentration used, the red band is almost quenched under VIS (489 nm) excitation, whereas it is enhanced under NIR excitation. Such a difference between photoluminescence and upconversion is explained taking into account the concentration dependent cross-relaxation process (H-2(11/2) +I-4(15/2)) --> (I-4(9/2) + I-4(13/2)). Experimental results suggest that two- and three-photon upconversion processes are taking place under 962 nm and 1438 nm excitation, respectively.
引用
收藏
页码：2489 / 2495
页数：7
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