posted on 2018-10-08, 00:00authored byVeeramani Rajendran, Mu-Huai Fang, Gabriel Nicolo
De Guzman, Tadeusz Lesniewski, Sebastian Mahlik, Marek Grinberg, Grzegorz Leniec, Slawomir M. Kaczmarek, Yan-Shen Lin, Kuang-Mao Lu, Chih-Min Lin, Ho Chang, Shu-Fen Hu, Ru-Shi Liu
The near-infrared (NIR) light source is desirable for real-time
nondestructive examination applications, which include the analysis
of foodstuffs, health monitoring, iris recognition, and infrared cameras.
The emission spectra of such an infrared light source should also
be as broad as possible for effective performance, in view of the
fact that the broad absorption and reflection of light by the organic
elements present in foodstuffs and human health fall in the blue and
NIR regions of the electromagnetic spectrum, respectively. In this
letter, a blue light-emitting diode (LED) excitable super broadband
NIR phosphor light source is developed with a high fwhm of 330 nm
and radiant flux of 18.2 mW for the first time. The observation of
super-broad-band luminescence from two distinct luminescence centers
is studied and evidenced by electron paramagnetic resonance, X-ray
absorption near-edge structure, steady-state luminescence, and time-resolved
luminescence at ambient and high-pressure environments. Finally, the
luminescence mechanism is discussed with the relevant configurational
coordinate diagrams.