Open AccessDeep red fluoride dots-in-nanoparticles for high color quality micro white light-emitting diodes
Author(s) -
Doan Thi Tuyet,
Thi Hong Quan Vu,
Bartosz Bondzior,
P.J. Dereń,
Ravi Teja Velpula,
Hieu Pham Trung Nguyen,
Luu Anh Tuyen,
Nguyễn Quang Hưng,
Hoang Duy Nguyen
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.400848
Subject(s) - color rendering index , chromaticity , materials science , light emitting diode , nanoparticle , phosphor , color temperature , diode , optoelectronics , quantum yield , quantum dot , red color , luminescence , nanostructure , optics , analytical chemistry (journal) , fluorescence , nanotechnology , chemistry , physics , chromatography
In this study, a novel nanostructure of fluoride red emitting phosphor is synthesized via soft templates. K 2 SiF 6 :Mn 4+ nanocrystals in the range of 3-5 nm diameter are found inside the porous K 2 SiF 6 :Mn 4+ nanoparticle hosts, forming unique dots-in-nanoparticles (d-NPs) structures with controlled optical properties. The porous K 2 SiF 6 :Mn 4+ d-NPs exhibit a sharp and deep red emission with an excellent quantum yield of ∼95.9%, and ultra-high color purity with the corresponding x and y in the CIE chromaticity coordinates are 0.7102 and 0.2870, respectively. Moreover, this nanophosphor possesses good thermal stability in range of 300 K-500 K, under light excitation of 455 nm. The K 2 SiF 6 :Mn 4+ d-NPs are covered onto a surface of 100×100 µm 2 blue-yellow In x Ga 1-x N nanowire light-emitting diode (LED) to make warm white LEDs (WLEDs). The fabricated WLEDs present an excellent color rendering index of ∼95.4 and a low correlated color temperature of ∼3649 K. Porous K 2 SiF 6 :Mn 4+ d-NPs are suggested as a potential red component for high color quality micro WLED applications.