Organic light-Emitting diode based on bis(10-phenylanthracen-9-yl)benzene derivatives with a stable white emission

Nitrogen-Free Bifunctional Bianthryl Leads to Stable White-Light Emission in Bilayer and Multilayer OLED Devices

“…The combined organic extract was dried over anhyd Na 2 SO 4 and filtered. The solvent was subsequently removed under reduced pressure to obtain a crude mixture, which was purified by silica gel column chromatography using a mixture of chloroform and pet ether (v/v 1:10 to 1:2) to obtain BATOMe as a yellowish solid, yield 2.23 g (91%); IR (KBr) cm −1 : 3062, 3004, 2929, 2836, 1590, 1451, 1415, 1365; 1 H NMR (CDCl 3 , 500 MHz): δ 3.90 (s, 12H), 6.71 (s, 2H), 6.80 (s, 4H), 7.14−7.17 (m, 4H), 7.23 (d, J = 8.55 Hz, 4H), 7.33− 7.36 (m, 4H), 7.91 (d, J = 8.60 Hz, 4H); 13 C NMR (CDCl 3 , 100 MHz): δ 55. 5, 100.1, 109.4, 125.3, 125.5, 127.0, 127.3, 129.8, 131.3, 133.4, 137.8,…”

“…Another approach for white-light emission entails casting of a multilayer device in which concurrent emission of different colors occurs from each layer, leading collectively to white light. − This method too requires a careful optimization of thicknesses of the layers to sequester white light from such devices and is by no means a trivial job. It is, therefore, of paramount importance to develop materials that lead to white-light emission in simple devices, which often exploit multispecies emission involving exciplex, electroplex, excimer, and so forth. − ,− …”

Benzothiazole derivatives with varied π-conjugation: synthesis, tunable solid-state emission, and application in single-component LEDs

“…6 In this case, excimers are formed through specific stacking between molecules in the aggregation state, which becomes an effective means of adjusting the light colour of the LED. 7 This concept has been used to prepare excimer-based WLEDs. 8 However, the WLEDs obtained in this way can be improved regarding their colour purity, photoelectric efficiency and other aspects.…”