The Er3+, Yb3+ upconversion couple, with its background-free green emission arising from the two thermally coupled 2H11/2 and 4S3/2 levels of Er3+, is a classic "workhorse" example of luminescent Boltzmann thermometry. In contrast, the Tm3+, Yb3+ couple rema... ...

请注册登录后继续浏览