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Up‐conversion phosphor plate for white lighting device using NIR excitation source
Author(s) -
In Jun H.,
Jang Ho S.,
Kim Ha J.,
Chung Woon J.,
Im Won B.
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17397
Subject(s) - phosphor , photon upconversion , optoelectronics , materials science , excited state , color rendering index , light emitting diode , excitation , diode , optics , luminescence , atomic physics , physics , quantum mechanics
Upconversion phosphors have numerous advantages compared to down conversion phosphor materials, such as a weak background interface, low excitation energy, sharp emission lines, and long lifetimes. Conventionally, blue laser diodes are used to obtain strong white light by combining green‐ and red‐emitting phosphors. The blue‐excited white‐light‐emitting devices can be harmful when the blue light penetrates directly into the human body. However, lower energy excited lighting devices does not harm the human body because of their low‐energy photons are compatible with the biologically safe window. Hence, we present a prototype device that converts invisible near‐infrared light into visible white light. For this, we synthesized orange‐emitting Y 2 O 3 :Er 3+ , Yb 3+ and blue‐emitting Y 2 O 3 :Tm 3+ , Yb 3+ upconversion phosphors using a solid‐state reaction. Using these, phosphor‐in‐glass (PiG) samples with sintered glass frit were prepared to investigate their optical behavior under low‐excitation energy. The emission color from the stacked PiGs depends on the color balance between the activator ions of Er 3+ , Tm 3+ , and Yb 3+ , and their balance is optimized to obtain a white light. The results might pave the way for designing safe white‐light‐emitting devices using a low‐energy excitation source.