Fast Recovery Diode (FRD) is a semiconductor diode with good switching characteristics and short reverse recovery time. It is mainly used in switching power supplies, PWM pulse width modulators, inverters and other electronic circuits as high-frequency rectifier diodes. Free-wheeling or damper diodes are used. The internal structure of the fast Recovery Diode is different from that of an ordinary PN junction diode. It belongs to a PIN junction diode, that is, a base region I is added between the P-type silicon material and the N-type silicon material to form a PIN silicon wafer. Since the base area is thin and the reverse recovery charge is small, the fast recovery diode has a short reverse recovery time, a low forward voltage drop, and a high reverse breakdown voltage (withstanding voltage).
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Nanda Optoelectronics said that the main reason for the decline in the company's performance was: In 2012, due to the impact of market supply and demand, the sales price of products declined, causing the performance to decline compared to 2011.
During the reporting period, the weighted average return on net assets decreased by 78.54 percentage points compared with the same period of last year. Mainly due to the receipt of funds raised by the company's initial public offering in 2012, resulting in a significant increase in net assets during the reporting period compared to the same period last year. 
Nanda Optoelectronics' net profit in 2012 dropped sharply by 49.35%
Nanda Optoelectronics released the 2012 performance report, with a total operating income of 177,305,700 yuan, down 45.09% from the previous year's 32,287,500 yuan; the net profit attributable to shareholders of the listed company was 900.275 million yuan, down 49.35% from the previous year's 177,774,500 yuan; The basic earnings per share was 2.15 yuan, down 54.45% from the previous year's 4.72 yuan.