Journal
ACS PHOTONICS
Volume 4, Issue 6, Pages 1539-1543Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00301
Keywords
NaYF4 hexagonal microrods; white-light lasing; whispering gallery mode; upconversion emission; lanthanide ions
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Funding
- Research Grants Council of Hong Kong [PolyU 153036/14P]
- National Nature Science Foundation of China [61378071, 61565009, 11664022]
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We demonstrate simultaneous red, green, and blue emission from a Yb3+-Er3+-Tm3+ tridoped hexagonal beta-NaYF4 microrod, which supports whispering-gallery-mode (WGM) resonance, to realize white-light lasing under near-infrared excitation at room temperature. This can be done by optimizing the upconversion efficiency and emission intensity balance of the blue, green, and red peaks through the proper tuning of sensitizer (Yb3+) and activator (Er3+, Tm3+) concentration in the host matrix. In addition, we minimize the difference of lasing threshold and maintain stable single-mode operation to achieve simultaneous red, green, and blue lasing by optimizing the radius of the hexagonal microrods.
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