Beyond the familiar lighting roadmap
OLEDs are an established emitter family and remain relevant to thin, diffuse surfaces; they are not the sole horizon for lighting innovation. [1] This future section now separates nanocarbon emitters, chemical and electrochemical light, fiber-delivered laser conversion, perovskite LEDs, and delayed-emission materials. These are different mechanisms and system architectures. The companion chapters tie reported results to journal papers and identify the conditions that a headline can conceal.
What counts as evidence
Our labels distinguish a reported material or device demonstration, an editorial engineering inference, and a Scenario or Hypothesis. We record DOI, publication year, reviewed access and limiting conditions in the local journal research records. Some papers were accessible only through a publisher abstract; we do not imply that their complete methods or raw data were independently checked. A peer-reviewed result can justify interest while leaving manufacturing, long operating life and general-lighting suitability unresolved.
Scenario, 2026–2036: specialized applications prove the case
Our hypothesis is that new light sources and delivery systems will first succeed where they solve a specific problem: a compact outlet, an unusual spectrum, a controlled signal or a maintained remote engine. A specialized demonstration is valuable on its own terms. It should not be promoted directly into a claim about cheaper, safer or more efficient street and room lighting. The journal chapters ask what further measurement would justify that next step.
Scenario, 2036–2051: useful systems integrate materials and service
DOE identifies opportunities in output, spectrum, timing and distribution, as well as the performance of connected systems. [2] [3] Our hypothesis is that new emitters could be integrated with serviceable drivers, optics, fiber routes, controls and verified maintenance procedures. The useful breakthrough would be the complete system meeting a need reliably. An advanced material inside an inaccessible, unrepairable assembly could still be a poor long-term choice.
Hypothesis, 2051–2076: more than one way to deliver light
A distant horizon should allow multiple possibilities rather than name a guaranteed successor to LEDs. Our hypotheses include remote engines feeding passive outlets, luminous converter surfaces, renewed semiconductor families and delayed-emission markers. Their adoption depends on demonstrated useful output, durability, responsible material handling, cost and user value. These horizon dates organize discussion; they are not predicted invention or commercialization dates.
How this chapter will be revised
The evidence threshold is a reproducible device, then a packaged system, then independently observed field performance. We will look for total electrical or chemical input, usable visible output, spectral quality, stability under realistic conditions and a documented maintenance method. Quantities such as photoluminescence yield, external quantum efficiency, optical conversion ratio and electrical lm/W must stay distinct. Future conclusions should change when those measurements improve, rather than when an impressive photograph or large extrapolated lifetime appears.