Efficient orange-red organic light-emitting diodes using 9,10-bis[4-(di-4-tert-butylphenylamino)styryl] anthracene as a fluorescent orange-red emitter

Achievement of High-Level Reverse Intersystem Crossing in Rubrene-Doped Organic Light-Emitting Diodes

“…This value is comparable to our experimental result, because this device mainly exploits the RISC channel of the exciplex host (mCP:PO-T2T) to achieve efficiency enhancement. In fact, although the 10% rubrene-doped device in Figure b has demonstrated an enhancement of EQE compared with some ordinary rubrene-doped devices, ,− this EQE appears to be relatively low as compared to the efficiency values reported from other material systems such as so-called TADF materials. ,, This is because our devices have not been optimized, causing SF and TQA processes detrimental to light emission to exist in the 10% rubrene-doped device.…”

Emitting materials based on phenylanthracene-substituted naphthalene derivatives for organic light-emitting diodes

“…This weak self-aggregation of compound 2 improved the EL efficiencies of device B in comparison with device A using compound 1. Furthermore, the higher fluorescent quantum yield of compound 2 (0.72) than that of compound 1 (0.55) in thin film state would partially play a role in the improved EL efficiencies of device B in comparison with device A [ 24,25]. Interestingly, the EQE value of device B using 2 is higher than that of device A using 1; however, the LE and PE values of device B are lower than those of device A.…”

Enabling a bright orange–red emission with a high EQE with a seven-member-ring based fluorescent emitter with a matching host

“…At 25,000 cd/m 2 , for example, an orange-red emission that peaked at 612 nm was observed with an EQE of 7.2%, with a corresponding efficacy of 2.3 lm/W and current efficiency of 11.4 cd/A. Notably, the device efficiencies are higher than those of the reported orange-red OLED devices even including those based on red phosphorescent dyes at similar luminance [19][20][21][22].…”

“…The synthesis was accomplished by a condensation reaction of reactant-3, i.e. 3-formyl-7-(N,N-diphenylamino)-5,5-spirofluorenyl-5H-dibenzo-[a,d]cycloheptene [19][20][21][22], with malononitrile (0.38 mL, 6.0 mmol) in the presence of acetic acid (0.25 mL, 0.05 mmol) and molecule sieve 4 Å A 0 (300 mg) in peridine (10 mL). The reaction mixture was stirred at ambient temperature for 4 h and then quenched with aqueous CH 3 COOH (HOAc/H 2 O = 1/9, 20 mL).…”