Anti-Stokes Emission under High Power Density Excitation in Vacuum
Abstract: Usually, the mechanisms of upconversion are mainly based on excitated state absorption, energy transfer upconversion and photon avalanche, where 4fN transitions are included in bandgap of host. Here, we present a special upconversion of lanthanide oxide under high power density excitation in vacuum that differs from three known mecha-nisms. Upconversion intensity-power fitting and photon conductance measuring demanstrate it is a bandgap excitation process from rare earth ion ground state to conduction band through a multi-photon process. The following deexcitation process from conduction band leads to various luminescence processes that arise from charge transfer band, radiative energy level transitions, exciton recombination and so on, together with thermal blackbody emission, forming a strong continue anti-stokes emission. Therefore this process is a collective interaction of the whole system for doping ion and substrate, and has luminescence mechanisms for both discrete luminescence centre and recombination of electrons and holes. Excitation power density, concentration of activated ion, pressure and bandgap of substrate are key experiment conditions to fulfill this anti-Stokes emission. Under 1 W excitation power with 50 W/cm2 power density of 980 nm NIR, it can achieve more than 10% energy transfer efficiency, 100,000 cd/m2 illumination, and 15 lm/W luminous effi-ciency and its chrominance can be continually tuned by pressure, power density and doping concentration. This kind of special anti-Stokes is not only worth investigating its mechanism and trying various systems in both theory and experi-ment, but also has potential applications in high luminosity point white light source, non-contact pressure meter and so on.
文章引用: 王绩伟 , 卢雪梅 , 刘兴辉 , 范晓星 , 王中文 , 梁雅秋 , 谭天亚 , 梅 勇 , 刘忠坤 , 郝建华 , TannerPeter A. (2013) 高激发功率密度与真空条件下的反斯托克斯发光过程。 现代物理， 3， 59-64. doi: 10.12677/MP.2013.32011
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