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NATURE PHOTONICS

A Rigid 3D Platinum(II) Emitter Enables Deep-Blue OLEDs with 13.1 nm Bandwidth and 670 h Half-Life

📅 September 4, 2026Li et al., Nature Photonics, 2025 , “High-Performance Deep-Blue Phosphorescent Organic Light-Emitting Diodes Enabled by a Platinum(II) Emitter”
A Rigid 3D Platinum(II) Emitter Enables Deep-Blue OLEDs with 13.1 nm Bandwidth and 670 h Half-Life

At LUMORA, deep-blue OLED material development is where color purity, brightness, efficiency, and operational lifetime must be optimized simultaneously. Tetradentate platinum complexes can harvest both singlet and triplet excitons, but their square-planar structures often stack in films, causing broad spectra, efficiency roll-off, and degradation. This study offers an integrated emitter-design solution: control the emitting triplet character and physically protect the metal complex from intermolecular interactions.

The Challenge: Blue Pt(II) Emitters Tend to Broaden and Stack

Narrow deep-blue Pt(II) phosphors often exhibit FWHM values above 20 nm and a pronounced vibronic sideband, which reduces color purity. Their two-dimensional square-planar geometry can also encourage Pt-Pt or π-π interactions and guest-host exciplex formation, red-shifting and broadening electroluminescence. A commercially meaningful deep-blue device needs low CIE y, narrow bandwidth, low high-brightness roll-off, and long life, not just high peak efficiency.

The Breakthrough: 3LE State Control plus 3D Steric Protection

PtQS1 introduces two complementary design elements. First, the extended BFCz unit increases the locally excited contribution in the T1 state and reduces interligand charge-transfer character, minimizing excited-state displacement and vibronic broadening while retaining enough metal-ligand charge-transfer character for efficient spin conversion. Second, the perpendicular PTBTP bulky group and tert-butyl-substituted phenyl units create a rigid three-dimensional geometry, eliminating observed intermolecular π-π stacking and restricting rotation without strongly perturbing the core excited state.

Emitter Platform: PtQS1

Key Results

First sub-20 nm deep-blue Pt(II) EL at CIE y < 0.15 The PtQS1 bottom-emitting device emits at 464 nm with 17.1 nm FWHM and CIE (0.127, 0.114). It shows no EL broadening relative to solution-phase PL and no detectable exciplex emission, validating the 3D steric strategy.
High efficiency at practical brightness PtQS1 reaches 32.4% EQE at 240 cd m−2 and retains 30.8%, 26.4%, and 23.2% at 1,000, 5,000, and 10,000 cd m−2, respectively. This low-roll-off behavior reflects reduced triplet-triplet and triplet-polaron annihilation together with complete host-to-dopant energy transfer.
Top emission sharpens the blue In a top-emitting microcavity architecture, PtQS1 retains a 464 nm peak but narrows to 13.1 nm FWHM and CIE (0.131, 0.062) at 1,000 cd m−2. These coordinates closely approach the BT.2020 blue target of (0.131, 0.046).
Industry-relevant blue index The top-emitting PtQS1 OLED runs at 3.9 V at 1,000 cd m−2 and reaches a maximum blue index of 468 cd A−1 CIEy−1. It retains 438, 374, and 325 cd A−1 CIEy−1 at 1,000, 5,000, and 10,000 cd m−2, respectively.
Long operational lifetime The single-unit top-emitting PtQS1 device has a 670 h half-life at an initial luminance of 1,000 cd m−2. A two-unit tandem top-emitting device delivers 13.0 nm FWHM, CIE (0.132, 0.063), a maximum blue index of 630 cd A−1 CIEy−1, and about 80 h LT90 at an initial luminance of 1,920 cd m−2.

Why This Matters for OLED Material Supply

For LUMORA, this research defines a high-performance materials platform for deep-blue phosphorescent displays: tetradentate Pt(II) complexes tuned toward 3LE-dominated triplet states, extended rigid heteroaromatic ligands, and bulky three-dimensional shielding groups that suppress concentration-dependent interactions. The supporting stack requires high-purity Pt(II) emitter intermediates, N-heterocyclic carbene and BFCz-type ligands, sterically demanding terphenyl building blocks, mixed SiCzCz/SiTrzCz2 host materials, and purpose-designed transport and injection layers. The result is a blue emitter concept that delivers narrow spectrum, unusually high efficiency at display brightness, low voltage, and credible long-term stability in both single-unit and tandem architectures.

Reference: Li, G.; Chu, Q.; Yao, H.; Wu, K.; She, Y.-B. Nat. Photonics 2025, 19, 977-984. “High-Performance Deep-Blue Phosphorescent Organic Light-Emitting Diodes Enabled by a Platinum(II) Emitter.” https://doi.org/10.1038/s41566-025-01706-0  10.1038/s41566-025-01706-0 →
#OLED #DeepBlueOLED #PlatinumEmitter #PtQS1 #PhOLED #TetradentatePt #NarrowbandEmission #TopEmittingOLED #BlueIndex #DisplayMaterials #LUMORA
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