Image 1 (IMAGE) Higher Education Press Caption Schematic diagram of the energy transfer relationship between Yb3+ and Er3+ ions Credit Miaomiao Wang, Mengyu Zhang, Shoujun Ding, Haitang Hu, Chuancheng Zhang, Yong Zou Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.