Wanga Hong, Yin Xiumei, Xing Mingming, Fu Yao, Tian Ying, Pang Tao, Feng Xin, Jiang Tao, Luo Xixian
Physics Department, Dalian Maritime University Dalian Liaoning 116026 PR China
College of Science, Huzhou University Huzhou Zhejiang 313000 PR China.
RSC Adv. 2018 May 4;8(30):16557-16565. doi: 10.1039/c8ra02503g. eCollection 2018 May 3.
Lanthanide ions have abundant excited-state channels which result in a radiation relaxation process generally accompanied by a non-radiation relaxation process. However, non-radiation relaxation processes will consume the activation energy and reduce the luminescence efficiency of the phosphor. Two lasers with an excitation energy which matched the ground state absorption and excited state absorption of ions were used to excite the phosphors to avoid the non-radiation relaxation process. This approach can achieve the purpose of populating specific states of the lanthanide ions, and furthermore effectively tunes the luminescence intensity and color output of the sample. Results show that the red emission intensity of the sample is significantly improved and this is caused by populating the F level under simultaneous 1510 nm and 980 nm excitation. Then when the 1510 nm and 808 nm co-operate to excite the sample, the green emission obtained increased sharply because the H/S states were efficiently populated. As a proof-of-concept experiment, this new approach has potential in the applications of solar cells.
镧系离子具有丰富的激发态通道，这导致辐射弛豫过程通常伴随着非辐射弛豫过程。然而，非辐射弛豫过程会消耗活化能并降低磷光体的发光效率。使用两台激发能量与离子的基态吸收和激发态吸收相匹配的激光器来激发磷光体，以避免非辐射弛豫过程。这种方法可以实现填充镧系离子特定态的目的，并且还能有效地调节样品的发光强度和颜色输出。结果表明，样品的红色发射强度显著提高，这是由在1510 nm和980 nm同时激发下填充F能级所致。然后，当1510 nm和808 nm协同激发样品时，由于H/S态被有效填充，获得的绿色发射急剧增加。作为概念验证实验，这种新方法在太阳能电池应用中具有潜力。
