The Quest for Efficient Blue OLEDs: Lordin’s ZRIET Technology Promises Brighter, Longer-Lasting Displays

OLED (Organic Light-Emitting Diode) display technology continues to advance, but a persistent challenge remains: the efficient production of blue light. While red and green OLEDs utilize phosphorescent materials with high energy efficiency, blue OLEDs traditionally rely on a less efficient fluorescent method. This disparity impacts overall display performance, driving up costs and limiting lifespan. Now, South Korean material company Lordin is claiming a breakthrough with its ZRIET (zero radius of intramolecular energy transfer) technology, potentially paving the way for brighter, cheaper and more durable OLED displays.

The Blue OLED Bottleneck

The difficulty in creating efficient blue OLEDs stems from the energy requirements of producing shorter wavelengths of light. Red and green phosphorescent OLEDs can harness energy from both singlet and triplet excited states, achieving 100% luminous efficiency. Fluorescent blue OLEDs, however, are limited to utilizing only singlet energy, capping efficiency at around 25%. To compensate, manufacturers often stack multiple layers of blue fluorescent material, increasing complexity and cost. This impacts both WOLED (White OLED) and QD-OLED (Quantum Dot OLED) technologies, albeit in different ways.

Lordin’s ZRIET Approach

Lordin’s ZRIET technology aims to overcome these limitations by combining the energy host and dopant into a single molecule. Traditional OLED emitters require energy to travel between molecules, resulting in energy loss over distance. ZRIET effectively eliminates this travel distance, minimizing energy waste. According to Lordin, its blue emitters can achieve over 20% external quantum efficiency and a lifespan approximately 60% longer than conventional fluorescent blue emitters. The company also reports a narrow spectral width, reaching a wavelength of 456 nanometers, which should translate to improved color accuracy in finished panels.

Securing the Supply Chain: Deuterium from India

Beyond the core technology, Lordin is strategically securing its supply chain. The company has reportedly secured a supply of deuterium, a non-radioactive isotope of hydrogen, from India. Deuterium acts as a stabilizer in OLED materials, extending their lifespan and improving stability. India is a major producer of deuterium due to its nuclear energy program.

Competition and Funding

While Lordin is making strides, it’s not alone in the pursuit of efficient blue PHOLEDs. Universal Display Corporation (UDC) currently leads the OLED material market, holding key patents for red and green dopants. However, UDC has yet to commercialize a phosphorescent blue emitter. Lordin’s CEO, Oh Young-hyun, emphasizes that his company’s technology utilizes a fundamentally different structure, potentially offering a competitive advantage.

Lordin is currently in the midst of a $25 million funding round, aiming to close it by the end of 2026, with plans for a public offering in South Korea the following year. LG Display also announced the commercialization of blue PHOLED for smaller screens, such as tablets and smartphones, in 2023, marking a significant first for the industry.

Looking Ahead

The development of efficient blue OLEDs is crucial for the continued advancement of display technology. With multiple companies, including Lordin and LG Display, actively pursuing solutions, the future looks promising. A diversified market with multiple suppliers will be essential to avoid reliance on any single entity and drive further innovation.