1461675-07-9

Upstream product

• 106-38-7 para-bromotoluene 
• 131-09-9 2-chloroanthracene-9,10-dione 

Downstream Products

• 524713-60-8 2-chloro-9,10-di-p-tolyl-9,10-dihydroanthracene-9,10-diol 

Relevant academic research and scientific papers

New anthracene derivatives as triplet acceptors for efficient green-to-blue low-power upconversion

Three new anthracene derivatives [2-chloro-9,10-dip-tolylanthracene (DTACl), 9,10-dip-tolylanthracene-2-carbonitrile (DTACN), and 9,10-di(naphthalen-1-yl)anthracene-2-carbonitrile (DNACN)] were synthesized as triplet acceptors for low-power upconversion. Their linear absorption, single-photon-excited fluorescence, and upconversion fluorescence properties were studied. The acceptors exhibit high fluorescence yields in DMF. Selective excitation of the sensitizer PdIIoctaethylporphyrin (PdOEP) in solution containing DTACl, DTACN, or DNA-CN at 532 nm with an ultralow excitation power density of 0.5 W cm-2 results in anti-Stokes blue emission. The maximum upconversion quantum yield (ΦUC=17.4 %) was obtained for the couple PdOEP/DTACl. In addition, the efficiency of the triplet-triplet energy transfer process was quantitatively studied by quenching experiments. Experimental results revealed that a highly effective acceptor for upconversion should combine high fluorescence quantum yields with efficient quenching of the sensitizer triplet. Three against three: Organic acceptors are used for triplet-triplet-annihilation upconversion and upconversion quantum yields of up to 17.4 % are observed. The efficient triplet-triplet-annihilation upconversion is attributed to an efficient quenching of the sensitizer triplet and the high fluorescence quantum yields.

Investigation of heavy atom effect on the low power upconversion

Selective low energy excitation of palladium(II)tetraphenylporphyrin (PdTPP) and palladium(II)tetrabromophenylporphyrin (PdBrTPP) in the presence of 2-chloro-9,10-di p-tolylanthracene (DTACl), respectively, can yield easily visualized upconversion fluores