title: Ultrabroad linewidth orange-emitting nanowires LED for high CRI laser-based white lighting and gigahertz communications.
abstract: Group-III-nitride laser diode (LD)-based solid-state lighting device has been demonstrated to be droop-free compared to light-emitting diodes (LEDs), and highly energy-efficient compared to that of the traditional incandescent and fluorescent white light systems. The YAG:Ce3+phosphor used in LD-based solid-state lighting, however, is associated with rapid degradation issue. An alternate phosphor/LD architecture, which is capable of sustaining high temperature, high power density, while still intensity- and bandwidth-tunable for high color-quality remained unexplored. In this paper, we present for the first time, the proof-of-concept of the generation of high-quality white light using an InGaN-based orange nanowires (NWs) LED grown on silicon, in conjunction with a blue LD, and in place of the compound-phosphor. By changing the relative intensities of the ultrabroad linewidth orange and narrow-linewidth blue components, our LED/LD device architecture achieved correlated color temperature (CCT) ranging from 3000 K to above 6000K with color rendering index (CRI) values reaching 83.1, a value unsurpassed by the YAG-phosphor/blue-LD counterpart. The white-light wireless communications was implemented using the blue LD through on-off keying (OOK) modulation to obtain a data rate of 1.06 Gbps. We therefore achieved the best of both worlds when orange-emitting NWs LED are utilized as "active-phosphor", while blue LD is used for both color mixing and optical wireless communications.
authors.forename: Bilal
authors.initials: B
authors.lastname: Janjua
authors.forename: Tien Khee
authors.initials: TK
authors.lastname: Ng
authors.forename: Chao
authors.initials: C
authors.lastname: Zhao
authors.forename: Hassan Makine
authors.initials: HM
authors.lastname: Oubei
authors.forename: Chao
authors.initials: C
authors.lastname: Shen
authors.forename: Aditya
authors.initials: A
authors.lastname: Prabaswara
authors.forename: Mohd Sharizal
authors.initials: MS
authors.lastname: Alias
authors.forename: Abdullah Ali
authors.initials: AA
authors.lastname: Alhamoud
authors.forename: Abdullah Awaad
authors.initials: AA
authors.lastname: Alatawi
authors.forename: Abdulrahman M
authors.initials: AM
authors.lastname: Albadri
authors.forename: Ahmed Y
authors.initials: AY
authors.lastname: Alyamani
authors.forename: Munir M
authors.initials: MM
authors.lastname: El-Desouki
authors.forename: Boon S
authors.initials: BS
authors.lastname: Ooi