TY - JOUR
T1 - Thermodynamic Limit for Excitonic Light-Emitting Diodes
AU - Giebink, Noel C.
AU - Forrest, Stephen R.
N1 - Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/6/30
Y1 - 2023/6/30
N2 - We derive the thermodynamic limit for organic light-emitting diodes (OLEDs), and show that strong exciton binding in these devices requires a higher voltage to achieve the same luminance as a comparable inorganic LED. The OLED overpotential, which does not reduce the power conversion efficiency, is minimized by having a small exciton binding energy, a long exciton lifetime, and a large Langevin coefficient for electron-hole recombination. Based on these results, it seems likely that the best phosphorescent and thermally activated delayed fluorescence OLEDs reported to date approach their thermodynamic limit. The framework developed here is broadly applicable to other excitonic materials, and should therefore help guide the development of low voltage LEDs for display and solid-state lighting applications.
AB - We derive the thermodynamic limit for organic light-emitting diodes (OLEDs), and show that strong exciton binding in these devices requires a higher voltage to achieve the same luminance as a comparable inorganic LED. The OLED overpotential, which does not reduce the power conversion efficiency, is minimized by having a small exciton binding energy, a long exciton lifetime, and a large Langevin coefficient for electron-hole recombination. Based on these results, it seems likely that the best phosphorescent and thermally activated delayed fluorescence OLEDs reported to date approach their thermodynamic limit. The framework developed here is broadly applicable to other excitonic materials, and should therefore help guide the development of low voltage LEDs for display and solid-state lighting applications.
UR - http://www.scopus.com/inward/record.url?scp=85164538173&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85164538173&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.130.267002
DO - 10.1103/PhysRevLett.130.267002
M3 - Article
C2 - 37450827
AN - SCOPUS:85164538173
SN - 0031-9007
VL - 130
JO - Physical review letters
JF - Physical review letters
IS - 26
M1 - 267002
ER -