Fluorescence upconversion properties of Er3+-doped TiO 2 and BaTiO3 nanocrystallites

Amitava Patra; Christopher S. Friend; Rakesh Kapoor; Paras N. Prasad

doi:10.1021/cm020897u

Fluorescence upconversion properties of Er³⁺-doped TiO ₂ and BaTiO₃ nanocrystallites

Amitava Patra
, Christopher S. Friend
, Rakesh Kapoor
, Paras N. Prasad

Chemistry

SUNY Buffalo

Research output: Contribution to journal › Article › peer-review

284 Scopus citations

Abstract

The effects of the erbium concentration, crystal size, crystal phase, and different processing temperatures on the upconverted emission of Er ³⁺ 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 ⁴I_11/2 and ⁴F _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 °C 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.

Original language	English
Pages (from-to)	3650-3655
Number of pages	6
Journal	Chemistry of Materials
Volume	15
Issue number	19
DOIs	https://doi.org/10.1021/cm020897u
State	Published - Sep 23 2003

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title = "Fluorescence upconversion properties of Er3+-doped TiO 2 and BaTiO3 nanocrystallites",

abstract = "The effects of the erbium concentration, crystal size, crystal phase, and different processing temperatures on the upconverted emission of Er 3+ 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 4I11/2 and 4F 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 °C 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.",

author = "Amitava Patra and Friend, \{Christopher S.\} and Rakesh Kapoor and Prasad, \{Paras N.\}",

year = "2003",

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T1 - Fluorescence upconversion properties of Er3+-doped TiO 2 and BaTiO3 nanocrystallites

AU - Patra, Amitava

AU - Friend, Christopher S.

AU - Kapoor, Rakesh

AU - Prasad, Paras N.

PY - 2003/9/23

Y1 - 2003/9/23

N2 - The effects of the erbium concentration, crystal size, crystal phase, and different processing temperatures on the upconverted emission of Er 3+ 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 4I11/2 and 4F 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 °C 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.

AB - The effects of the erbium concentration, crystal size, crystal phase, and different processing temperatures on the upconverted emission of Er 3+ 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 4I11/2 and 4F 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 °C 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.

UR - https://www.scopus.com/pages/publications/0141425509

U2 - 10.1021/cm020897u

DO - 10.1021/cm020897u

M3 - Article

AN - SCOPUS:0141425509

SN - 0897-4756

VL - 15

SP - 3650

EP - 3655

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 19

ER -

Fluorescence upconversion properties of Er³⁺-doped TiO ₂ and BaTiO₃ nanocrystallites

Abstract

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