6Karotki A, Kruk M, Drobizhev M, et al. Efficient singlet oxygen generation upon two-photon excitation of new porphyrin with enhanced nonlinear absorption [ J ]. IEEE J. Selected Topics in Quantum Electron,2001 (7) :971-975.
7Miller C C, Zong Yuqiu, Ohno Y. LED photometric calibrationsat the National Institute of Standards and Technology and fu- ture measurement needs of LEDs [ J ]. Proc. Of SP1E , 2004, 5530:69-79.