Energy transfer is usually applied in ratiometric thermometry, but it often decreases sensitivities due to much reduced distinguishment in the thermal responses of two different‐colored emitters. Herein, a feasible strategy to restrain energy transfer is utilized for achieving sensitive high‐temperature detection, simply by increasing the dopant concentration to induce microphase separation. Atomic force microscopy phase images reveal that this phase separation becomes dominant when the doping ratio reaches above 40%. This results in suppression of energy transfer, which is evidenced by systematic photophysical investigations. On this basis, by using heat‐resistant emitters, a series of inexpensive and easily prepared solid‐film organic high‐temperature ratiometric thermometers are developed. They exhibit a broad eye‐detective sensing range of 102–236 °C with the relative sensitivity ( S r ) higher than 0.5% K −1 and the maximum temperature resolution attaining 0.39 K. Good reversibility and stability are also demonstrated in ambient atmosphere.

Light‐tunable resistive switching (RS) characteristics are demonstrated in a photochromophore (BMThCE)‐based resistive random access memory. Triggered by nondestructive ultraviolet or visible light irradiation, two memory‐type RS characteristics can be reversibly modulated in the same device upon a narrow range of applied voltage (<6 V), accompanied by the photochromophores in the active layer reversibly changed between ring‐open state (namely, o‐BMThCE) and ring‐closed state (namely, c‐BMThCE). The o‐BMThCE‐based memory exhibits a write‐once‐read‐many characteristic with a high current on/off ratio of 105, while the c‐BMThCE‐based one shows a flash characteristic. Both of the RS characteristics present good nonvolatile stability with the resistance states maintained over 104 s without variation. This RS modulation is possibly related to the formation and rupture of conductive filaments, which formed along channels consisting of BMThCE trapping molecules. This work provides a new memory element for the design of light‐controllable high density storage and data encryption technology.

A multifunctional nanoparticle system based on a cationic conjugated polymer/hyaluronan–cisplatin complex for tumor-targeting cell imaging and drug delivery.

The solution-processable, anthraquinone-based, fluorene bipolar fluorescent material 2-(9,9'-bis (2-ethylhexyl)-9H-fluoren-2-yl)anthracene-9,10-dione (FAA) was synthesized via a Suzuki reaction. The photophysical properties of FAA were subsequently investigated by acquiring absorption and photoluminescence spectra, and its optical properties were studied using computational density functional theory methods. Data obtained from single-carrier devices incorporating FAA demonstrated its well-matched bipolar charge-transport characteristics. The electroluminescence performance of this material was also examined by doping FAA into a 1,3-di(9H-carbazol-9-yl)benzene (mCP) matrix as the light-emitting layer via spin coating to produce an organic light-emitting diode (OLED) with an indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene:poly(styrenesulfonate) (PEDOT:PSS)/mCP:FAA/3,3'-(5'-(3-(pyridin-3-yl)phenyl)-[1,1':3',1 ''-terphen-yl]-3,3 ''-diyl)dipyridine (TmPyPb)/LiF/Al structure. This device exhibited a maximum luminance of 1719 cd.m(-2) with a turn-on voltage of 7.4 V, along with maximum current and power efficiencies of 1.66 cd.A(-1) and 0.56 Im.W-1, respectively. The electroluminescence mechanism of the OLED is discussed based on the energy level diagrams of the functional layers.