Package Study of Organic Phosphor C545P Application for White Light-Emitting Diodes

• Main Authors: Ching-Kai Chang, 張淨剴
• Other Authors: Yan-Kuin Su
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/35357788818880189905

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === Recently, white light - emitting diodes (LEDs) are mostly achieved by suing blue LED pumping yellow phosphor. This type of device has higher luminous efficiency but bad color rendering index (CRI). In order to improve CRI of white LED, this thesis used organic material C545P to fabricate white light-emitting diode. Two methods were proposed to fabricate white LED. One is to use UV-LED (380nm) pumping organic phosphor C545P for white LED. The other is to use blue LED (460nm) pumping red/organic material C545P mixed phosphor for white LED. The experiments show that these two methods can obtain higher CIR of white LED. In the first method, it is difficult to use only one kind phosphor to improve the allocation of UV-LED pumping GRB phosphor. The second method can obtain better luminous efficiency and light intensity of white LED. In the same condition, it has higher CRI as compared with general blue LED pumping red/green mixed phosphor. The luminous efficiencies for this device are 40.7lm/W and 23.8lm/W at 20mA and 350mA, respectively. In other words, the fabrication of white LED with organic phosphor C545P can lead to excellent device performance.