Platinum complexes are one of the most promising emitters for organic light-emitting diodes(OLEDs)and they have been studied for decades.However,it is still challenging to realize high-performance solution-processed O...Platinum complexes are one of the most promising emitters for organic light-emitting diodes(OLEDs)and they have been studied for decades.However,it is still challenging to realize high-performance solution-processed OLEDs by using the platinum complex as an emissive dopant.Herein,a nonplanar terdentate[Pt(N^C^N)Cl]emitter(Pt1)with good solubility and film-forming ability,ultrahigh photoluminescence quantum yield(98%in PMMA film),and short excited-state lifetime(1.5μs in solution)is presented to achieve this goal.This complex is designed and synthesized by using a nonplanar ligand strategy.Solution-processed OLEDs of Pt1 are successfully fabricated to show a _(max)imum external quantum efficiency(EQE_(max))of 16.14%,a _(max)imum current efficiency(CE_(max))of 46.36 cd A^(-1),a _(max)imum luminance(L_(max))of 13990 cd m^(-2),and operating half-lifetime(LT_(50))of 288 min,respectively,representing the highest performance recorded so far based on the terdentate platinum complexes.More importantly,the large-area(144 mm^(2))OLEDs of Pt1 with high EQE_(max) of 10.28%and uniform luminance of 8076 cd m^(-2)have been achieved,indicating a high potential of Pt1 for commercial applications.展开更多
基金supported by the National Natural Science Foundation of China(22004041,21925112,22090021,and 22305251)the National Key R&D Program of China(2023YFE0125200).
文摘Platinum complexes are one of the most promising emitters for organic light-emitting diodes(OLEDs)and they have been studied for decades.However,it is still challenging to realize high-performance solution-processed OLEDs by using the platinum complex as an emissive dopant.Herein,a nonplanar terdentate[Pt(N^C^N)Cl]emitter(Pt1)with good solubility and film-forming ability,ultrahigh photoluminescence quantum yield(98%in PMMA film),and short excited-state lifetime(1.5μs in solution)is presented to achieve this goal.This complex is designed and synthesized by using a nonplanar ligand strategy.Solution-processed OLEDs of Pt1 are successfully fabricated to show a _(max)imum external quantum efficiency(EQE_(max))of 16.14%,a _(max)imum current efficiency(CE_(max))of 46.36 cd A^(-1),a _(max)imum luminance(L_(max))of 13990 cd m^(-2),and operating half-lifetime(LT_(50))of 288 min,respectively,representing the highest performance recorded so far based on the terdentate platinum complexes.More importantly,the large-area(144 mm^(2))OLEDs of Pt1 with high EQE_(max) of 10.28%and uniform luminance of 8076 cd m^(-2)have been achieved,indicating a high potential of Pt1 for commercial applications.
