Pith Number

pith:Y7EP47US

pith:2026:Y7EP47USV74BDFLS5CV3O5Z3WR

not attested not anchored not stored refs pending

Blue Organic Light-Emitting Diodes with External Quantum Efficiencies over 20% Based on Europium(II) Emitters

Carsten Rothe, Felix Kaden, Mahmoud Soleimani, Roman Tkachov, Sebastian Reineke, Sebastian Schellhammer, Toni B\"arschneider

A rigid europium(II) complex delivers 20.7 percent external quantum efficiency in a blue OLED.

arxiv:2604.06476 v2 · 2026-04-07 · physics.app-ph · cond-mat.mtrl-sci

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\usepackage{pith}
\pithnumber{Y7EP47USV74BDFLS5CV3O5Z3WR}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The complex sublimes without decomposition and can be vacuum-deposited into a bottom-emitting, single-host OLED architecture, delivering an external quantum efficiency (EQE) of 20.7% with minimal roll-off (19.3% at 1000 cd m-2) and a narrowband electroluminescence with CIE coordinates of (0.12, 0.25).

C2weakest assumption

That the rigid aza-crown europium(II) complex maintains near-unity photoluminescence quantum yield after vacuum deposition and that this directly translates to the reported electroluminescence efficiency in the single-host device without additional losses or decomposition.

C3one line summary

A new europium(II) complex delivers 20.7% EQE in blue OLEDs with pure emission, minimal roll-off, and CIE coordinates of (0.12, 0.25).

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-06-26T01:15:51.364452Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c7c8fe7e92aff8119572e8abb7773bb4507ce5791ea4bc0fe8823a58ba342e8b

Aliases

arxiv: 2604.06476 · arxiv_version: 2604.06476v2 · doi: 10.48550/arxiv.2604.06476 · pith_short_12: Y7EP47USV74B · pith_short_16: Y7EP47USV74BDFLS · pith_short_8: Y7EP47US

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/Y7EP47USV74BDFLS5CV3O5Z3WR \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: c7c8fe7e92aff8119572e8abb7773bb4507ce5791ea4bc0fe8823a58ba342e8b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d771315446e2176c1f7734a56aeb6739e844d12dd2e6a3012f8121a2cb16fe84",
    "cross_cats_sorted": [
      "cond-mat.mtrl-sci"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.app-ph",
    "submitted_at": "2026-04-07T21:22:57Z",
    "title_canon_sha256": "fa89719ce6539626de1eabe3675ef5dde34699acf638917743d7bf69ef65683e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.06476",
    "kind": "arxiv",
    "version": 2
  }
}