Potential white light-emitting diode (LED) phosphor , which remains superfluous due to its unstable nature in the presence of moisture, was successfully integrated in a high-power white LED system by developing a glass-based phosphor plate. A glass system with softening temperature at around 600°C, which lies far below the possible decomposition temperature of the sulfide phosphor, provides a stable shield. Physical properties such as thermal stability, transparency, and lower porosity along with chemical stability under operating conditions of the LEDs ensure long-term operability. emission due to the decomposition of sulfide phosphors, which leads to corrosion of LED electrodes, was contained using the developed plate. Higher thermal resistivity of the developed glass system in comparison with conventional resins ensures lower thermal quenching of the luminescence and better color purity.
© 2013 Optical Society of America
(230.3670) Optical devices : Light-emitting diodes
(250.5230) Optoelectronics : Photoluminescence
Original Manuscript: July 22, 2013
Manuscript Accepted: July 29, 2013
Published: August 22, 2013
Jin Seok Lee, Sanjith Unithrattil, Sunghoon Kim, In Jae Lee, Hyungeui Lee, and Won Bin Im, "Robust moisture and thermally stable phosphor glass plate for highly unstable sulfide phosphors in high-power white light-emitting diodes," Opt. Lett. 38, 3298-3300 (2013)