Deep red fluoride dots-in-nanoparticles for high color quality micro white light-emitting diodes

Doan Thi Tuyet, Vu Thi Hong Quan, Bartosz Bondzior, Przemysław Jacek Deren, Ravi Teja Velpula, Hieu Pham Trung Nguyen, Luu Anh Tuyen, Nguyen Quang Hung, Hoang Duy Nguyen

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


In this study, a novel nanostructure of fluoride red emitting phosphor is synthesized via soft templates. K2SiF6:Mn4+ nanocrystals in the range of 3-5 nm diameter are found inside the porous K2SiF6:Mn4+ nanoparticle hosts, forming unique dots-in-nanoparticles (d-NPs) structures with controlled optical properties. The porous K2SiF6:Mn4+ 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 K2SiF6:Mn4+ d-NPs are covered onto a surface of 100×100 µm2 blue-yellow InxGa1−xN 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 K2SiF6:Mn4+ d-NPs are suggested as a potential red component for high color quality micro WLED applications.

Original languageEnglish (US)
Pages (from-to)26189-26199
Number of pages11
JournalOptics Express
Issue number18
StatePublished - Aug 31 2020

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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