Influences of Mg~(2+) ion on dopant occupancy and upconversion luminescence of Ho~(3+) ion in LiNbO_

• 作 者: 代丽 徐超 张颖 李大勇 徐玉恒
• 机 构: School of Materials Science and Engineering,Harbin University of Science and Technology,Applied Scie
• 出 处: Chinese Physics B
• 发表日期: 2013年09期
• 关键词: luminescence dopant excitation spectroscopic bands yellow homogeneity transition

The effects of a Mg2+ ion on the dopant occupancy and upconversion luminescence of a Ho3+ ion in LiNbO3 crystal are reported. The birefringence gradient of the crystal is measured to investigate the optical homogeneity. The X-ray powder diffraction spectrum and the upconversion luminescence are used to investigate defect structure and spectroscopic properties of Mg,Ho:LiNbO3 . Under 808-nm excitation, blue, red, and very intense yellow-green bands are observed. Based on the energy levels of Ho3+ in LiNbO3 , and the pump intensity dependence of the observed emission, an excitation scheme is presented. The upconversion emission spectra reveal an enhancement of upconversion intensity when the Mg2+ ions are introduced into Ho:LiNbO3 . The main upconversion mechanism is discussed in this work.

The effects of a Mg2 + ion on the dopant occupancy and upconversion luminescence of a Ho3 + ion in LiNbO3 crystal are reported. The birefringence gradient of the crystal is measured to investigate the optical homogeneity. The X-ray powder diffraction spectrum and the upconversion luminescence are used to investigate defect structure and spectroscopic properties of Mg, Ho: LiNbO3. Under 808-nm excitation, blue, red, and very intense yellow-green bands are observed. Based on the energy levels of Ho3 + in LiNbO3, and the pump intensity dependence of The observed emission, an excitation scheme is presented. The upconversion emission spectra reveal an enhancement of upconversion intensity when the Mg2 + ions are introduced into Ho: LiNbO3. The main upconversion mechanism is discussed in this work.