Absolute Quantum Yield Measurements of Near-Infrared Emission with Correction for Solvent Absorption

Abstract

In this work, we evaluated the effect of solvent absorption during photoluminescence quantum yield (PLQY) measurements of near-infrared (NIR) emission with an integrating sphere (IS) instrument, and propose an effective correction method. Transmittance spectra of representative solvents measured with an IS instrument showed significant absorption bands in the first NIR region (NIR-I; 700–950 nm), and more prominently in the second NIR (NIR-II; 1000–1700 nm) region due to overtones and a combination of fundamental vibrations involving C–H and O–H stretching modes. The emission spectra of typical NIR-I and NIR-II emitting compounds exhibited dips owing to solvent absorption, resulting in somewhat reduced PLQY values. We utilized the transmittance spectrum of the solvent to correct the observed emission spectrum. Distortion due to solvent absorption was properly corrected, and additional corrections for the reabsorption/reemission effect gave more reliable PLQY values.

Photophysical Properties of Indocyanine Green in the Shortwave Infrared Region

“…In water, the Φ F we measured (2.9 %) agrees with two previous studies by Philip et al [47] . and Jin et al ., [48] and is only slightly less than Hoshi et al [49] . Particularly in water, solvent reabsorption effects may impact the accuracy of the Φ F measurement [46] .…”

Polymethine‐Based Semiconducting Polymer Dots with Narrow‐Band Emission and Absorption/Emission Maxima at NIR‐II for Bioimaging

“…The fluorescence quantum yields of the resulting Pdots were determined by using IR‐1061 in CH 2 Cl 2 as the reference. Instead of using IR‐26 as the reference owing to the variations of its quantum yields on different reports, [4o, 8a, 14b] we used IR‐1061 with a certified value of 0.59 % in CH 2 Cl 2 , [20] in which its quantum yield was carefully corrected for reabsorption and reemission under the excitation light at 925 nm. Pttc‐SeBTa‐NIR1125 Pdots exhibited a good quantum yield of 0.18 %, while Pttc‐SeBTa‐NIR1380 Pdots possessed a modest quantum yield of 0.05 % in aqueous solutions (Table S1).…”

Polymethine‐Based Semiconducting Polymer Dots with Narrow‐Band Emission and Absorption/Emission Maxima at NIR‐II for Bioimaging

“…Thef luorescence quantum yields of the resulting Pdots were determined by using IR-1061 in CH 2 Cl 2 as the reference. Instead of using IR-26 as the reference owing to the variations of its quantum yields on different reports, [4o, 8a, 14b] we used IR-1061 with acertified value of 0.59 %inCH 2 Cl 2 , [20] in which its quantum yield was carefully corrected for reabsorption and reemission under the excitation light at 925 nm. Pttc-SeBTa-NIR1125 Pdots exhibited ag ood quantum yield of 0.18 %, while Pttc-SeBTa-NIR1380 Pdots possessed am odest quantum yield of 0.05 %inaqueous solutions (Table S1).…”