title: Size dependence of silica nanospheres embedded in 385 nm ultraviolet light-emitting diodes on a far-field emission pattern.
abstract: We demonstrate that the use of silica nanospheres (SNs) with sizes close to the emission wavelength of light-emitting diodes (LEDs) can enhance the light output power and manipulate the far-field emission pattern. Near-ultraviolet (NUV)-LEDs grown on a patterned sapphire substrate embedded with 300 nm SNs show a three times higher light output power than that without SNs, when measured through the top side. For far-field emission measurements, the LEDs embedded with 300 nm SNs show the significant increase of front emission due to the improved crystal quality of epitaxial films as well as the increase of Mie scattering effect of SNs. These experimental results indicate the important role of the size of embedded SNs in enhancing the light output power for NUV-LEDs.
authors.forename: Young Jae
authors.initials: YJ
authors.lastname: Park
authors.forename: Nam
authors.initials: N
authors.lastname: Han
authors.forename: Beo Deul
authors.initials: BD
authors.lastname: Ryu
authors.forename: Min
authors.initials: M
authors.lastname: Han
authors.forename: Kang Bok
authors.initials: KB
authors.lastname: Ko
authors.forename: Tran Viet
authors.initials: TV
authors.lastname: Cuong
authors.forename: Jaehee
authors.initials: J
authors.lastname: Cho
authors.forename: Eun-Kyung
authors.initials: EK
authors.lastname: Suh
authors.forename: Chang-Hee
authors.initials: CH
authors.lastname: Hong
mesh_terms: D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D008422:Materials Testing; D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D012031:Refractometry / Q000295:instrumentation; D012542:Scattering, Radiation; D012666:Semiconductors; D012822:Silicon Dioxide / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014466:Ultraviolet Rays
chemical_list: D012822:Silicon Dioxide