Organic light-emitting diodes(OLEDs)are an advanced technology used in full-color displays.These systems suffer from a main limitation,i.e.,the low efficiency of blue OLEDs,and emitters are critical to solve this issu...Organic light-emitting diodes(OLEDs)are an advanced technology used in full-color displays.These systems suffer from a main limitation,i.e.,the low efficiency of blue OLEDs,and emitters are critical to solve this issue.Here,we developed a new strategy to design robust Pt(Ⅱ)emitters with enhanced molecular rigidity and increased locally excited character.An obtained Pt(Ⅱ)emitter exhibited an extremely narrow emission spectrum peaking at 458.6 nm,with a full-width at half-maximum(FWHM)of 16.0 nm and a small Huang-Rhys factor of 0.278,together with a high quantum efficiency of 95%.The emitter-doped OLED peaked at 464 nm with a high color purity(FWHM=19 nm),and high external quantum efficiencies(EQEs)of 32.6%,29.4%,and 26.9%at 123,1000,and 5000 cd/m^(2),respectively.The device also achieved a record-high maximum brightness of up to 84895 cd/m^(2) among reported deep-blue OLEDs with Commission Internationale de l’Éclairage y-coordinate<0.15.This device represents one of the highest-performing deep-blue OLEDs reported to date.展开更多
基金supported by the National Natural Science Foundation of China (22178319,22478357,and 22138011)the Zhejiang Province Vanguard Goose-Leading Initiative (2024C01260)。
文摘Organic light-emitting diodes(OLEDs)are an advanced technology used in full-color displays.These systems suffer from a main limitation,i.e.,the low efficiency of blue OLEDs,and emitters are critical to solve this issue.Here,we developed a new strategy to design robust Pt(Ⅱ)emitters with enhanced molecular rigidity and increased locally excited character.An obtained Pt(Ⅱ)emitter exhibited an extremely narrow emission spectrum peaking at 458.6 nm,with a full-width at half-maximum(FWHM)of 16.0 nm and a small Huang-Rhys factor of 0.278,together with a high quantum efficiency of 95%.The emitter-doped OLED peaked at 464 nm with a high color purity(FWHM=19 nm),and high external quantum efficiencies(EQEs)of 32.6%,29.4%,and 26.9%at 123,1000,and 5000 cd/m^(2),respectively.The device also achieved a record-high maximum brightness of up to 84895 cd/m^(2) among reported deep-blue OLEDs with Commission Internationale de l’Éclairage y-coordinate<0.15.This device represents one of the highest-performing deep-blue OLEDs reported to date.
