Advances in Persistence Phosphors Activated by Blue-light
CHEN Bida1, GAN Guisheng1,2, WU Yiping1, OU Yanjie3
1 College of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074; 2 College of Materials Science and Engineering,Chongqing University of Technology, Chongqing 400054; 3 Zhuoran Optoelectronics Co.Ltd, Jiangmen 529000
Abstract: As it is energy savings, environmental friendliness and fast switching, white light-emitting diode (w-LED) has become the new generation of lighting sources. It is commonly used that applying blue LED chip to excite the yellow YAG∶Ce3+ phosphor to synthesis white light. However, adding the DC (direct current)/AC (alternating current) conversion and heat-dissipation radiators makes the w-LED too expensive, which restricts the further development of w-LED seriously. AC-LED, a LED device driven by city power, is the inevitable direction of LED development. Furthermore, it is possible that applying afterglow phosphors in AC-LED. This paper provides a review of the persistence phosphors motivated by blue light in AC-LED, and the length of afterglow time is calculated. What’s more, the afterglow intensity and the decay rates are analyzed at the same time. The results of the paper showed that the afterglow decay time of phosphors is Tx(6.67 ms≤Tx≤10 ms), and the minimum value of afterglow intensity is greater than 0.032 mcd/m2. Meanwhile, the decay rate of afterglow satisfied the forum (1) in the text, and the afterglow is occurred at T/2—2T/3,which is the most beneficial to eliminate flicker effect.
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2017, Vol. 31 
