Fluorescence upconversion properties of Er3+-doped TiO2 and BaTiO3 nanocrystallites

被引：253

作者：

Patra, A ^{[1
]}

Friend, CS ^{[1
]}

Kapoor, R ^{[1
]}

Prasad, PN ^{[1
]}

机构：

[1] SUNY Buffalo, Inst Lasers Photon & Biophoton, Dept Chem, Buffalo, NY 14260 USA

来源：

CHEMISTRY OF MATERIALS | 2003年 / 15卷 / 19期

关键词：

D O I：

10.1021/cm020897u

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of the erbium concentration, crystal size, crystal phase, and different processing temperatures on the upconverted emission of Er3+ in BaTiO3 and TiO2 nanocrystals are reported. A cw diode laser at 975 nm was used as a pump source for resonant sequential excitation of the I-4(11/2) and F-4(7/2) levels. Green and red upconversion emission at 550 and 670 nm were observed from these oxide nanocrystals with 975 nm excitation. With the same Er3+ concentration, the upconversion emission intensity from BaTiO3 was higher than that observed in the TiO2 host. In the TiO2 matrix, the maximum upconversion emission intensity of Er3+ was found for samples calcined at 800 degreesC where both the anatase and the rutile phases were present. The observed emission characteristics and the pump intensity dependence of the luminescence intensity confirm that the upconverted emission in these materials is produced by two-photon excited-state absorption (ESA) processes.

引用

页码：3650 / 3655

页数：6

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