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Mass‐Manufactural Lanthanide‐Based Ultraviolet B Microlasers
Author(s) -
Jin Limin,
Wu Yunkai,
Wang Yujie,
Liu Shuai,
Zhang Yuqi,
Li Zhiying,
Chen Xian,
Zhang Wenfei,
Xiao Shumin,
Song Qinghai
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201807079
Subject(s) - lasing threshold , materials science , ultraviolet , laser , optoelectronics , whispering gallery wave , lanthanide , substrate (aquarium) , wavelength , optics , ion , oceanography , geology , physics , resonator , quantum mechanics
Lanthanide (Ln 3+ )‐based ultraviolet B (UVB) microlasers are highly desirable for diagnostics and phototherapy. Despite their progress, the potential applications of UVB microlasers are strongly hindered by their low optical gain, weak light confinements, and poor device repeatability. Herein, a novel all‐in‐one approach to solve the above limitations and realize mass‐manufactural UVB microlasers is reported. The gain coefficient at 289 nm is improved from two aspects, i.e., the enhanced absorption via LiYbF 4 :Tm(1mol%)@LiYbF 4 @LiLuF 4 core–shell–shell nanocrystals and the suppression of competitive ultraviolet emissions. Consequently, by spin‐coating the solution onto a patterned SiO 2 substrate, high‐quality Ln 3+ ‐based microdisks are formed by self‐assembly on each SiO 2 pillar and UVB whispering‐gallery‐mode lasers are realized. The resulted lasing threshold is an order of magnitude smaller than the shortest deep‐ultraviolet emission at 310.5 nm. Importantly, the lasing wavelengths and mode numbers of UVB lasers are highly controllable and repeatable, making them suitable for mass production for the first time.