Host to Guest Energy Transfer Mechanism in Phosphorescent and Fluorescent Organic Light-Emitting Devices Utilizing Exciplex-Forming Hosts
Bibliographic record
Abstract
The use of exciplex-forming hosts has recently emerged as an avenue to obtain very high efficiency with phosphorescent dopants in organic light-emitting devices (OLEDs). The exact electroluminescence (EL) mechanism, however, is still not clearly understood. In this work, we use time-resolved photoluminescence measurements and find that the EL mechanism is primarily based on efficient energy transfer from the exciplex to the emitter guest. By altering the distance between the guest and the exciplex-formation interface, we further uncover that this energy transfer occurs mostly by the Dexter mechanism. The results explain the high efficiency of phosphorescent OLEDs based on an exciplex-forming host and shed light on the reasons behind the significant difference in the efficiency of OLEDs utilizing exciplex-forming hosts when used with phosphorescent versus fluorescent emitters.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".