Display substrate and display apparatus
Provided are a display substrate and a display apparatus. The display substrate includes a drive circuit layer and a light emitting structure layer stacked on a substrate. The light emitting structure layer includes an anode, a cathode, and an emitting layer, a hole block layer, and an electron transport layer disposed between the anode and the cathode; the hole block layer and the electron transport layer satisfy: EETL/EHBL>1; where EETL is the electromigration rate of the electron transport layer, and EHBL is the electromigration rate of the hole block layer.
1 . A display substrate comprising a drive circuit layer and a light emitting structure layer stacked on a substrate, wherein the light emitting structure layer comprises an anode, a cathode, and an emitting layer, a hole block layer, and an electron transport layer disposed between the anode and the cathode; the hole block layer and the electron transport layer satisfy:
EETL/EHBL>1;
where EETL is the electromigration rate of the electron transport layer, and EHBL is the electromigration rate of the hole block layer;
wherein the material of the hole block layer comprises one or more of a compound having the following structural formula:
2 . The display substrate according to claim 1 , wherein the hole block layer and the electron transport layer satisfy:
|HOMOETL−HOMOHBL|≥0.1 Ev;
wherein HOMOETL is a Highest Occupied Molecular Orbital (HOMO) energy level of the electron transport layer and HOMOHBL is a HOMO energy level of the hole block layer.
3 . The display substrate according to claim 1 , wherein the hole block layer and the electron transport layer satisfy:
|LUMOETL−LUMOHBL|≥0.2 eV;
wherein LUMOETL is the Lowest Unoccupied Molecular Orbital (LUMO) energy level of the electron transport layer, and LUMOHBL is the LUMO energy level of the hole block layer.
4 . The display substrate according to claim 1 , wherein the electromigration rate of the electron transport layer is 10 −7 cm 2 /Vs to 10 −5 cm 2 /Vs, and the electromigration rate of the hole block layer is 10 −8 cm 2 /Vs to 10 −7 cm 2 /Vs.
5 . The display substrate according to claim 1 , wherein the display substrate further comprises a light modulation layer disposed on a side of the light emitting structure layer away from the substrate; the light modulation layer has a refractive index nR in a wavelength range of 600 nm to 640 nm, a refractive index nG in a wavelength range of 510 nm to 550 nm, and a refractive index nB in a wavelength range of 440 nm to 480 nm, and the light modulation layer satisfies:
|nB−nG|≤ 0.1 ,|nB−nR|≤ 0.2.
6 . The display substrate according to claim 5 , wherein the light modulation layer has a refractive index refractive index greater than or equal to 1.85 in a wavelength range of 600 nm to 640 nm, a refractive index greater than or equal to 1.95 in a wavelength range of 510 nm to 550 nm, and a refractive index greater than or equal to 2 in a wavelength range of 440 nm to 480 nm.
7 . The display substrate according to claim 5 , wherein the material of the light modulation layer comprises a compound having the following structural formula:
wherein, Ar1 to Ar3 are independently substituted or unsubstituted aryl groups having 6 to 30 ring carbon atoms, or substituted or unsubstituted heteroaryl groups having 5 to 20 ring atoms.
8 . The display substrate according to claim 5 , wherein the material of the light modulation layer comprises one or more of a compound having the following structural formula:
9 . A display apparatus, comprising the display substrate according to claim 1 .
10 . The display substrate according to claim 2 , wherein the display substrate further comprises a light modulation layer disposed on a side of the light emitting structure layer away from the substrate; the light modulation layer has a refractive index nR in a wavelength range of 600 nm to 640 nm, a refractive index nG in a wavelength range of 510 nm to 550 nm, and a refractive index nB in a wavelength range of 440 nm to 480 nm, and the light modulation layer satisfies:
|nB−nG|≤ 0.1 ,|nB−nR|≤ 0.2.
11 . The display substrate according to claim 3 , wherein the display substrate further comprises a light modulation layer disposed on a side of the light emitting structure layer away from the substrate; the light modulation layer has a refractive index nR in a wavelength range of 600 nm to 640 nm, a refractive index nG in a wavelength range of 510 nm to 550 nm, and a refractive index nB in a wavelength range of 440 nm to 480 nm, and the light modulation layer satisfies:
|nB−nG|≤ 0.1 ,|nB−nR|≤ 0.2.
12 . The display substrate according to claim 4 , wherein the display substrate further comprises a light modulation layer disposed on a side of the light emitting structure layer away from the substrate; the light modulation layer has a refractive index nR in a wavelength range of 600 nm to 640 nm, a refractive index nG in a wavelength range of 510 nm to 550 nm, and a refractive index nB in a wavelength range of 440 nm to 480 nm, and the light modulation layer satisfies:
|nB−nG|≤ 0.1 ,|nB−nR|≤ 0.2.