Organic light-emitting diode structure and fabrication method thereof, related display panel, and related display device
The present disclosure provides an organic light-emitting diode device (OLED) structure for compensating blue light emission. The OLED structure includes a substrate with a thin-film transistor layer, the substrate being substantially transparent; and a first electrode layer on the substrate, the first electrode being substantially transparent; a first light-emitting layer on the first electrode layer with one or more light-emitting portions for emitting light for compensating blue light. The OLED structure also includes a charge generation layer (CGL) with a reflective portion, the CGL on the first light-emitting layer, the reflective portion having a transmission rate for light emitted by the first light-emitting layer; a second light-emitting layer on the CGL with one or more light-emitting portions for emitting the blue light; and a second electrode layer with a reflectivity on the second light-emitting layer.
1. An organic light-emitting diode device (OLED) structure for compensating blue light emission, comprising:
a substrate with a thin-film transistor (TFT) layer, the substrate being substantially transparent;
a first electrode layer on the substrate, the first electrode being substantially transparent;
a first light-emitting layer on the first electrode layer with one or more light-emitting portions for emitting light for compensating blue light;
a charge generation layer (CGL) with a reflective portion, the CGL being on the first light-emitting layer, the reflective portion of the CGL having a transmission rate for light emitted by the first light-emitting layer;
a second light-emitting layer on the CGL with one or more light-emitting portions for emitting the blue light; and
a second electrode layer with a reflectivity on the second light-emitting layer, wherein:
the OLED structure includes a microcavity structure having the CGL, the second electrode layer, and the second light-emitting layer;
the first light-emitting layer includes a green light-emitting portion for emitting green light and a red light-emitting portion for emitting red light; and
a portion of the green light and a portion of the red light transmit into the microcavity to be converted into a second portion of blue light.
2. The OLED structure according to claim 1 , wherein the reflective portion in the CGL includes a metal layer.
3. The OLED structure according to claim 2 , wherein the CGL includes an electron injection layer (EIL) and a hole injection layer (HIL), the EIL containing the metal layer.
4. The OLED structure according to claim 3 , wherein:
the EIL is made of Al and LiF; and
the HIL is made of NPB(N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine) doped with MoO 3 .
5. The OLED structure according to claim 3 , wherein:
the EIL includes an Al layer having a thickness of about 10-20 nm.
6. The OLED structure according to claim 1 , wherein the green light-emitting portion and the red light-emitting portion include at least a light-emitting material with a broad full width at half maximum (FWHM).
7. The OLED structure according to claim 6 , wherein the green light-emitting portion emits light containing blue light or light close to blue light.
8. The OLED structure according to claim 1 , wherein the first electrode layer is an anode layer and the second electrode layer is a cathode layer.
9. The OLED structure according to claim 1 , wherein the first electrode layer is made of indium tin oxide (ITO), and the second electrode layer is made of Al with a thickness of about 300 nm.
10. The OLED structure according to claim 1 , further including:
a first carrier transport layer between the first light-emitting layer and the first electrode layer; and
a second carrier transport layer between the first light-emitting layer and the CGL.
11. The OLED structure according to claim 1 , further including:
a third carrier transport layer between the second light-emitting layer and the CGL; and
a fourth carrier transport layer between the second light-emitting layer and the second electrode layer.
12. The OLED structure according to claim 1 , wherein the second light-emitting layer includes a blue light-emitting portion for emitting a first portion of the blue light.
13. The OLED structure according to claim 1 , wherein a portion of light emitted by the first light-emitting layer transmits through the CGL into the microcavity structure.
14. A method for fabricating an organic light-emitting diode (OLED) structure, comprising:
providing a substrate with a thin-film transistor layer on the substrate, the substrate being substantially transparent;
forming a first electrode layer on the substrate, the first electrode layer being substantially transparent;
forming a first light-emitting layer on the first electrode layer with one or more light-emitting portions for emitting light for compensating blue light;
forming a charge generation layer (CGL) with a reflective portion on the first light-emitting layer, the reflective portion has a transmission rate for light emitted by the first light-emitting layer;
forming a second light-emitting layer on the CGL with one or more light-emitting portions for emitting the blue light; and
forming a second electrode layer with a reflectivity on the second light-emitting layer, wherein:
the OLED structure includes a microcavity structure having the CGL, the second electrode layer, and the second light-emitting layer;
the first light-emitting layer includes a green light-emitting portion for emitting green light and a red light-emitting portion for emitting red light; and
a portion of the green light and a portion of the red light transmit into the microcavity to be converted into a second portion of blue light.
15. A display panel, including the OLED structure of claim 1 .
16. A display device, including the display panel of claim 15 .
17. The method for fabricating an organic light-emitting diode (OLED) structure according to claim 14 , wherein the green light-emitting portion and the red light-emitting portion include at least a light-emitting material with a broad full width at half maximum (FWHM).
18. The method for fabricating an organic light-emitting diode (OLED) structure according to claim 17 , wherein the green light-emitting portion emits light containing blue light or light close to blue light.
19. The method for fabricating an organic light-emitting diode (OLED) structure according to claim 14 , wherein a portion of light emitted by the first light-emitting layer transmits through the CGL into the microcavity structure.
20. The method for fabricating an organic light-emitting diode (OLED) structure according to claim 14 , wherein the CGL includes an electron injection layer (EIL) and a hole injection layer (HIL), the EIL containing the metal layer.
21. An organic light-emitting diode device (OLED) structure for compensating blue light emission, comprising:
a substrate with a thin-film transistor (TFT) layer, the substrate being substantially transparent;
a first electrode layer on the substrate, the first electrode being substantially transparent;
a first light-emitting layer on the first electrode layer with one or more light-emitting portions for emitting light for compensating blue light;
a charge generation layer (CGL) with a reflective portion, the CGL being on the first light-emitting layer, the reflective portion of the CGL having a transmission rate for light emitted by the first light-emitting layer;
a second light-emitting layer on the CGL with one or more light-emitting portions for emitting the blue light; and
a second electrode layer with a reflectivity on the second light-emitting layer, wherein:
the OLED structure includes a microcavity structure having the CGL, the second electrode layer, and the second light-emitting layer;
the first light-emitting layer includes a green light-emitting portion for emitting green light and a red light-emitting portion for emitting red light; and
the green light-emitting portion and the red light-emitting portion include at least a light-emitting material with a broad full width at half maximum (FWHM).
22. The OLED structure according to claim 21 , wherein the green light-emitting portion emits light containing blue light or light close to blue light.
23. An organic light-emitting diode device (OLED) structure for compensating blue light emission, comprising:
a substrate with a thin-film transistor (TFT) layer, the substrate being substantially transparent;
a first electrode layer on the substrate, the first electrode being substantially transparent;
a first light-emitting layer on the first electrode layer with one or more light-emitting portions for emitting light for compensating blue light;
a charge generation layer (CGL) with a reflective portion, the CGL being on the first light-emitting layer, the reflective portion of the CGL having a transmission rate for light emitted by the first light-emitting layer;
a second light-emitting layer on the CGL with one or more light-emitting portions for emitting the blue light; and
a second electrode layer with a reflectivity on the second light-emitting layer, wherein:
the OLED structure includes a microcavity structure having the CGL, the second electrode layer, and the second light-emitting layer;
the second light-emitting layer includes a blue light-emitting portion for emitting a first portion of the blue light; and
a portion of light emitted by the first light-emitting layer transmits through the CGL into the microcavity structure.