DEEP RESEARCH · Duksan Neolux (213420)

Duksan Neolux: OLED Material Leadership and a Quantum Leap into Non-emissive and Semiconductor Materials

Black PDL · Tandem IT OLED · PSPI/PR · HHI Turbomachinery — a re-rating into a diversified electronic-materials company

Date: 2025-12-26 · Display & semiconductor materials analysis · Gemini-assisted draft

0. Bottom line first

Interpretation: The market has long discounted the stock as "single-customer (SDC) + single-product (OLED organics)." 3Q25 revenue +79% YoY and OP +40% YoY, combined with the turbomachinery consolidation, signal that this discount narrative is beginning to break.

1. Corporate identity and economic moat

Duksan Neolux was spun off from Duksan Hi-Metal in December 2014 as a specialized OLED organic-material company. Headquartered in Cheonan, it began with Samsung Display (SDC) as a captive customer and has now evolved into a co-development partner.

Official fact: As of 3Q24, the company holds 980 registered patents and 2,477 patent applications. Its purification capacity is regarded as the world's largest.

Product portfolio: ① HTL (hole transport layer) — cash cow, biggest beneficiary of Tandem; ② Red Host — adopted in flagship Galaxy S and Z series; ③ R/G Prime — efficiency/lifetime boosters; ④ Black PDL — non-emissive insulator.

2. Black PDL — the hidden hero of foldable innovation

Commercialized first in the world in 2021, Black PDL (Pixel Define Layer) is a game changer that eliminates the polarizer — historically a mandatory component of OLED panels. By replacing the inter-pixel barrier with a black material that suppresses ambient-light reflection, it enables Samsung Display's Eco² OLED structure.

Official fact: Legacy stack — cover window → polarizer → encapsulation → transparent PDL → emission layer. Eco² OLED — cover window → color filter → encapsulation → Black PDL → emission layer. The thick opaque polarizer is removed.

Interpretation: Expanding from premium foldable niche to higher-volume bar flagships (Galaxy S26 etc.) materially lifts the non-emissive revenue mix. If Apple's foldable iPhone (2H26–2027 expected) adopts Black PDL (CoE), the company secures supplier status inside the Apple supply chain.

3. New growth engines: PSPI / PR / CP / Industrial

3.1 PSPI · semiconductor materials

PSPI (photosensitive polyimide) is used as semiconductor insulator and barrier. Polyimide synthesis and formulation know-how accumulated through Black PDL directly feeds PSPI development.

Official fact: Per 3Q25 report, of 523 total new-material patent filings, 303 are PR-related. Focus is on low-temperature cure PSPI suitable for next-generation processes.

Interpretation: AI semiconductor demand is exploding the need for HBM and 2.5D/3D packaging RDL insulators. Successful PSPI entry unlocks a "display → semiconductor materials" multiple expansion.

3.2 Conductive Particle (CP) — acquired 2023

Acquired from Duksan Hi-Metal, CP is the core material of anisotropic conductive film (ACF). Demand for fine-pitch CP is rising with higher-resolution displays and minimized bezels. Existing nano-scale synthesis know-how is being applied to quality improvement.

3.3 HHI Turbomachinery — industrial diversification

Closed in late 2024/early 2025, this acquisition added large pumps and compressors used in semiconductor fabs, power plants, petrochemicals and LNG vessels.

Official fact: Through 3Q25 cumulative, KRW ~80bn revenue contribution at ~13% OPM. 3Q standalone contribution: KRW 33.2bn revenue and KRW 6.5bn OP (~19% OPM).

4. End markets: IT OLED super-cycle + Tandem expansion

Apple opened the IT OLED door with the 2024 iPad Pro and plans expansion through MacBook Pro, iPad mini/Air around 2026.

5. Earnings impact and outlook

5.1 3Q25 — growth with a small miss

Official fact: 3Q25 consolidated revenue KRW 98.3bn (+22% QoQ, +79% YoY); OP KRW 17.5bn (+70% QoQ, +40% YoY).

• Growth drivers: Galaxy Z Fold6/Flip6 launch, robust Black PDL demand, HHI Turbomachinery consolidation (KRW 33.2bn revenue, KRW 6.5bn OP).
• Miss: standalone OLED-material results slightly below consensus; iPhone 16 series shipments partly slipped into 4Q.

5.2 2025–2026 quantum leap

2026 catalysts: ① iPad mini/Air OLED expansion, ② MacBook Pro OLED material supply start, ③ visibility into foldable iPhone supply chain, ④ Black PDL adoption in Samsung bar-type flagships.

6. Balance-sheet health — post-M&A profile

Official fact: Debt-to-equity rose from 13.4% (end-2023) to 52.9% (3Q25) reflecting HHI acquisition borrowings and consolidated debt. 3Q25 cumulative operating cash flow KRW 27.9bn. Credit rating A- (stable).

Interpretation: 50%-range gearing remains healthy versus manufacturing peers. Core 20% OPM plus the steady cash generation of the acquired industrial business comfortably cover interest expense.

7. Valuation and conclusion

The stock trades around 12–13x 12-month forward PER — historical band lows. Global OLED-material peer UDC typically trades at 25–30x, so the discount looks excessive.

Given the structural IT OLED super-cycle and material diversification ahead from 2026, current levels look like an attractive medium- to long-term entry point.