5Cz-TRZ

CAS Number 2043597-42-6

Blue Dopant Materials, Dopant Materials, Materials, OLED Materials, Semiconducting Molecules, TADF Materials

TADF Blue Dopant Material with Triazine-based Pentacarbazolylbenzene

Thermally activated delayed fluorescent emitter for highly efficient OLEDs, 5Cz-TRz, CAS 2043597-42-6

5Cz-TRZ, 9,9',9'',9''',9''''-(6-(4,6-Diphenyl-1,3,5-triazin-2-yl)benzene-1,2,3,4,5-pentayl)pentakis(9H-carbazole), is a highly efficient sky-blue TADF emitter. It consists of five electron donating carbazole and one 4,6-diphenyl-1,3,5-triazine units around a hexagonal benzene ring. 5Cz-TRZ is well known for its fast kRISC of 1.5 × 10⁷ s⁻¹, almost two orders of magnitude higher than those of typical TADF emitters. 5Cz-TRZ has a small singlet–triplet energy splitting, large spin–orbit couplings, and a dense manifold of triplet states energetically close to the singlets.

Unsublimed grade

High purity > 98.0%

Worldwide shipping

Quick and reliable shipping

Very Fast RISC rate

High kRISC of 1.5 × 10⁷ s⁻¹

Narrow Triplet and Singlet Energy Gap

ΔE_ST of 0.06 eV

OLEDs based on 5Cz-TRZ as blue dopant and mCBP as host exhibit high maximum external quantum efficiency of 29.3%, and good device stability with estimated T₉₀ about 600 h for 1,000 cd m^-2. Also, 5Cz-TRZ exhibits an extremely low efficiency roll‐off mainly due to the fast rate of reversed intersystem crossing. For example, the efficiency remains at 28.6% at 1000 cd m^-2 and still as high as 27.0% at 5000 cd m^-2, corresponding to a 2.3% decrease in EQE even at high brightness intensities.

5Cz-TRZ features the following as a TADF material.

A small energy gap (ΔE_ST) between its singlet and triplet states
A high RISC rate of 1.5 × 10⁷ s⁻¹
A high ΦPL of 99% (15 wt% mCBP)
A τ_d of 0.8 μs in DMF

General Information

CAS number	2043597-42-6
Chemical formula	C₈₁H₅₀N₈
Molecular weight	1135.32 g/mol
Absorption*	λ_max
Fluorescence	λ_em 486 nm (Toluene)
HOMO/LUMO	HOMO = 5.90 eV, LUMO = 3.00 eV
Synonyms	9,9',9'',9''',9''''-(6-(4,6-Diphenyl-1,3,5-triazin-2-yl)benzene-1,2,3,4,5-pentayl)pentakis(9H-carbazole)
Classification / Family	Triazines, Blue dopant, TADF blue emitter.

Product Details

Purity	Unsublimed >98% (HNMR)
Melting point	T_m = 473 °C
Appearance	White powder/crystals

Chemical Structure

5cz-trz, 2043597-42-6 — 9,9',9'',9''',9''''-(6-(4,6-Diphenyl-1,3,5-triazin-2-yl)benzene-1,2,3,4,5-pentayl)pentakis(9H-carbazole) (5Cz-TRZ) chemical structure, 2043597-42-6

MSDS Documentation

5Cz-TRZ MSDS Sheet

Literature and Reviews

L. Cui et al. (2020); Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states, Nat. Photonics, 14, 636–642; DOI: 10.1038/s41566-020-0668-z.
D. Sun et al. (2022); 1,3,5-Triazine-Functionalized Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes, Adv. Photnics Res., 3 (11), 2200203; DOI: 10.1002/adpr.202200203.
X. Tang et al. (2024); Stable pure-green organic light-emitting diodes toward Rec.2020 standard, Nat. Commum., 15, 4394; DOI: 10.1038/s41467-024-48659-6.

Y. zhang et al. (2023); High-efficiency all fluorescence white OLEDs with high color rendering index by manipulating excitons in co-host recombination layers, Nanoscale, 15, 14249-14256; DOI: 10.1039/D3NR02568C.
L. Chen et al. (2022); Solution-processed white OLEDs with power efficiency over 90 lm W−1 by triplet exciton management with a high triplet energy level interfacial exciplex host and a high reverse intersystem crossing rate blue TADF emitter, Mater. Horiz., 9, 1299-1308; DOI: 10.1039/D1MH02060A.