Abstract
A blue phosphor Ca 2PO 4Cl:Eu 2+ (CAP:Eu 2+) was synthesized by solid state reaction. The Ca 2PO 4Cl:Eu 2+ exhibited high quantum efficiency and excellent thermal stability. The luminescent intensity of Ca 2PO 4Cl:Eu 2+ was found to be 128% under excitation at 380 nm, 149% under 400 nm, and 247% under 420 nm as high as that of BaMgAl 10O 17:Eu 2+. The optimal doping concentration was observed to 11 mol.% of CAP:Eu 2+. The energy transfer between Eu 2+ ions in CAP were occurred via electric multipolar interaction, and the critical transfer distance was estimated to be 1.26 nm. A mixture of blue-emitting Ca 2PO 4Cl:Eu 2+, green-emitting (Ba,Sr) 2SiO 4:Eu 2+ and red-emitting CaAlSiN 3:Eu 2+ phosphors were selected in conjunction with 400 nm chip to fabricate white LED devices. The average color-rendering index R a and correlated color temperature ( T c) of the white LEDs were found to be 93.4 and 4590 K, respectively. The results indicated that it was a promising candidate as a blue-emitting phosphor for the near-UV white light-emitting diodes.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
