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Tuning Long‐Lived Mn(II) Upconversion Luminescence through Alkaline‐Earth Metal Doping and Energy‐Level Tailoring
Author(s) -
Liu Xiaowang,
Yi Zhigao,
Qin Xian,
Liu Hong,
Huang Wei,
Liu Xiaogang
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201900519
Subject(s) - photon upconversion , materials science , luminescence , doping , dopant , lanthanide , alkaline earth metal , excitation , ion , optoelectronics , metal , chemistry , physics , organic chemistry , quantum mechanics , metallurgy
Crystal‐site engineering of hexagonal‐phase NaGdF 4 :Mn through alkaline‐earth metal (A 2+ ) doping is used to tune the upconversion luminescence of the Mn 2+ dopants. Experimental and calculated results show the ability of A 2+ doping to alter the occupancy site of Mn 2+ ion from Na + to Gd 3+ , thus enabling an emission change from green (520 nm) to yellow (583 nm) upon excitation at 980 nm. The yellow emission of Mn 2+ shows a long emission lifetime of 65 ms, more than three times longer than the green emission of Mn 2+ (20 ms). The combination of tunable long‐lived Mn 2+ emission with lanthanide emission at a single‐particle level provides a convenient route to triple transient upconversion color codes upon dynamic excitation, which offers an attractive optical feature particularly suitable for efficient document encoding.