It is well known that the balanced charge injection helps prepare high-performance red light-emitting diodes (LEDs) in the electroactive material CsPbBr x I 3- x quantum dots (QDs). Employing a hydrothermal method, we synthesized MoO 2 nanocrystals and doped them into Poly(3,4-ethylenedioxythiophene) /poly(styrenesulfonate) (PEDOT:PSS). The results show that the synthesized MoO 2 nanocrystals can modulate the work function of PEDOT:PSS and enhance the conductivity of the PEDOT:PSS films, which is attributed to disrupting the hydrogen bond between PEDOT and PSS, and inducing the transition of PEDOT from benzoid to quinoid structure. In the PEDOT:PSS- x MoO 2 film, the work function increases from 4.9 eV to 5.09 eV when the content of x is 15%, which reduces the energy barrier between the PEDOT:PSS- x MoO 2 and the hole transport layer: poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)-benzi (poly-TPD), thus promoting the hole transport and improving the V on of the devices. Additionally, the device's external quantum efficiency (EQE) reaches a maximum value of 7.53% at x = 15% enabling an improvement of 2.6 times over the base device (EQE=2.10%). This work proves that PEDOT:PSS- x MoO 2 as a hole transport layer is an effective material for preparing high-performance QD-LEDs.
Phototherapy, including photothermal and photodynamic therapy, has gained extensive attention in the tumor treatment field recently, while synergistic therapy can significantly improve curative effects. However, a complicated photo-responsive nanosystem, different excitation wavelengths, and low tissue depth hindered its actual application. Herein, single near-infrared responsive PEGylated defective MoO2 nanocrystals were fabricated by a green hydrothermal method. The photothermal and photodynamic performances of the samples were presented in detail under a safe power of 1064 nm (NIR-II, 1.0 W cm−2). Interestingly, the photodynamic properties were prompted by the localized surface plasmon resonance (LSPR) photothermal effect obviously, and the collaborative enhancement mechanism was explored in depth. Subsequently, the in vitro cytotoxicity was evaluated on the 4T1 cancer cells under NIR-II irradiation. This work may provide guidance for the facile fabrication of TMOs for NIR-II responsive and enhanced dual-modal phototherapy.
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