September 2024

Researchers from China's Southern University of Science and Technology, by simultaneously measuring the electroluminescence-photoluminescence, have identified the presence of leakage electrons in QD-EL devices, which leads to the discrepancy of the electroluminescence and the photoluminescence roll-off.

The researchers then developed a single photon counting technique, the enables them to detect the weak photon signals and thus provides a means to visualize the electron transport paths at different voltages. By reducing the amount of leakage electrons, the researchers developed a QD-EL device with an internal power conversion efficiency of over 98%.

Korean QD producer Hansol Chemical, has conducted an analysis on some of TCL's QLED panels, and concluded that in fact these panels do not contain any quantum dots. Hansol commissioned SGS and Intertek to actually perform the study, on TCL's C755, C655 and C655 Pro models.

Hansol says that TCL's TVs do not contain any indium or cadmium at all, which proves the TVs do not contain quantum dots. TCL responded by saying that the TVs do in fact contain Cadmium, although perhaps at a very trace amount not detected by SGS and Intertek. TCL further says that the method used is not sufficient to detect the exact content of Cadmium.