OAM-RC

Abstract

BaGd2ZnO5 microcrystalline powders with different Nd3+ doping concentrations were prepared by high temperature solid phase method. All products were confirmed to be pure phase of BaGd2ZnO5 by X-ray diffraction pattern analysis. The diffuse reflection spectrum of the microcrystalline powder was measured by an integrating sphere and the absorption spectrum was calculated. According to Judd Ofelt theory, the spectral intensity parameters were calculated to be Ω 2 0.42×10−20𝑐𝑚2, Ω 4 1.14×10−20𝑐𝑚2, and Ω 6 4.32×10−20𝑐𝑚2, respectively. The theoretical oscillator strength and experimental oscillator strength of the sample were also calculated and their deviation is 7.53×10−7. Then, the transition probability, transition branch ratio and energy level lifetime of Nd 3+ are obtained. The upconversion emission spectra under 808 nm excitation were measured and several significant upconversion emission peaks at 328 nm, 385 nm, 420 nm, 477 nm, 528 nm, 564 nm and 595 nm, were observed. Fitting relationship curve of upconversion intensity to LD working current, indicates that luminescence at 385 nm, 420 nm and 477 nm belongs to two photon process. Concentration quenching effect has also been observed. The calculation of the CIE color coordinates shows that all the coordinates of the six samples located at blue green region..

Keywords

BaGd2ZnO5, Nd3+, Judd Ofelt theory, CIE coordinates.

Citation

T. ZHU, C. NIU, Y. LV, Upconversion luminescence and Judd Ofelt analysis of Nd3+ ions in BaGd2ZnO5 microcrystals, Optoelectronics and Advanced Materials - Rapid Communications, 14, 7-8, July-August 2020, pp.359-366 (2020).

Submitted at: July 4, 2019

Accepted at: Aug. 18, 2020